tModLoader - Calamity Modes Guide

In this guide, I describe in detail, each of Calamity Mod's modes, what they do, and what they change.

Calamity Modes Overview

Revengeance Mode

Revengeance Mode can be activated if the current world is in Expert Mode. After opening up your starter bag, you will get an item called Revengeance, which can toggle Revengeance Mode on and off in an Expert Mode world. Additionally, this item can be crafted for free at a demon altar. Revengeance Mode is the recommended difficulty for new players.

• The player gains a Rage and Adrenaline meter - The Rage meter is filled up when getting hit by enemies and enemy projectiles, hitting enemies with True Melee Weapons, and wearing the Heart of Darkness or Draedon's Heart accessories. A hotkey can be pressed to activate Rage Mode once the meter is full, which boosts player damage by 50% for 5 seconds and resets the meter.
• The Adrenaline meter is filled up over time when fighting a boss, and the meter is reset without any bonus if the player gets hit. The meter takes a total of 45 seconds to fill up, but using the Electrolyte Gel Pack, Starlight Fuel Cell, and Ectoheart will reduce the fill up time down to 20 seconds. A hotkey can be pressed to activate Adrenaline Mode once the meter is full, which boosts player damage by 150% for 5 seconds, and resets the meter.
• Enemies drop double the normal amount of money.
• Enemies spawn 15% more frequently.
• Players cannot have more than 2 seconds of invincibility frames.
• Asphalt player acceleration max is reduced by 33%.
• Shadow Dodge set bonus lasts 6 seconds instead of 30 seconds.
• The Nurse healing cost scales depending on game progression, and cost is increased by 5 times if a boss is alive.
• If the player is inflicted with Ichor, they will take 25% more damage. If inflicted with Cursed Inferno, they will take 20% more damage.
• Life regeneration has 50% effectiveness at full health, and scales up to 100% effectiveness when at 1 health.
• Before any boss is defeated, the player takes 20% less damage.
• Most enemies and bosses get percentages of damage reduction.

Revengeance Mode changes the way many enemies work as well.

• Many enemies inflict the horror or marked debuff - Horror reduces the target'a defence by 15, and movement speed and acceleration by 15%, along with making the screen darker. Marked reduces the target's damage reduction by 50%, along with tinting them purple.
• Many enemies are immune to lifesteal.
• Reapers, Mimics, Present Mimics, Wraiths, and Sand Elementals have knockback immunity.
• Lizhards transform phases at 90% health.
• Mothrons are larger.
• In Hardmode, projectiles that are fired by Goblin Summoners, Goblin Sorcerers, and Tim, inflict Shadowflame along with Shadowflame Apparitions.
• Ice Golems move and shoot faster as they lose health.
• Mother Slimes create more Baby Slimes upon death.
• Dungeon Guardians shoot homing skulls which deal the same amount of damage as a Dungeon Guardian.
• Cursed Hammers, Crimson Axes, and Enchanted Swords attack the player without interruption, when their health is below 50%, along with Clingers, Black Recluses, Plagueshells, Gastropods, Ice Tortoises, Sand Tortoises, and Giant Tortoises when below 25% health, as well as Paladins when below 15% health.

Revengeance Mode also adds in a variety of unique items that can only be obtained in a Revengeance Mode world.

• Ectoheart
• Electrolyte Gel Pack
• Starlight Fuel Cell
• Mushroom Plasma Root
• Infernal Blood
• Red Lightning Container
• Purified Jam
• Aegis Blade
• Apotheosis
• Briny Baron
• Blossom Flux
• Cold Divinity
• Cosmic Discharge
• Drataliornus
• Halibut Cannon
• Karasawa
• Kelvin Catalyst
• Malachite
• Pristine Fury
• Sea's Searing
• SHPC
• Vehemence
• Vesuvius
• Fox Drive
• Charred Relic
• Fabsol
• Brimrose
• Suspicious Looking Jelly Bean
• Astral Arcanum
• Celestial Jewel
• The Community
• Corrosive Spine
• Draedon's Heart
• Counter Scarf
• Heart of Darkness
• Laudanum
• Crown Jewel
• Frost Flare
• Siren's Heart
• Spectral Veil
• Stress Pills

Revengeance Mode (Boss Part 1)

This is a continuation of Revengeance Mode.

Along with enemy changes, Revengeance Mode changes many boss mechanics and stats.

• King Slime.
• Teleports more often and more quickly.
• Jump speed and movement speed is increased.
• Jumps higher and faster based on player elevation.
• Contact damage is increased by 25%.
• Creates every different kind of slime when damage.
• Under 50% life, summons an invincible Crown Jewel that fires Ruby Bolts at the player which deal 55% of King Slime's contact damage.

• Health is increased to 4240.
• When summoned, also summons 2 smaller Desert Scourges.
• Shoots sand projectiles at the player.

• Health increased to 4550.
• Charges more frequently in Phase 1.
• Enters Phase 2 at 75% health.
• Charges more frequently and randomly in Phase 2.
• Greatly increased contact damage in Phase 2.
• Servants of Cthulhu and Eye of Cthulhu inflict horror for 2 seconds.
• Servants of Cthulhu do not drop hearts.
• Has 4 different sub phases in which it has different dash chains, as well as in Sub Phase 4, it vomits Servants of Cthulhu.

• Health increased to 6400.
• Sometimes summons horizontal lines of mushrooms that fall downwards.
• Jump speed and movement speed is increased.
• Crab Shrooms fall more quickly.
• Jump pattern changes below 50% health.
• Crab Shroom walls are tilted slightly below 50% health.

• Maximum Health increased to 17716.
• Head segments shoot cursed flames.
• Body segments retain the same speed even after being segmented.
• Head Segments deal 23% more contact damage, and non Head Segments deal 25% more contact damage.
• More defensive to piercing.
• Segment count increased.
• Moves more quickly and shoots Cursed Flames and Vile Spit more often the less segments there are alive.

• Creeper health increased to 240, Brain of Cthulhu health increased to 2720.
• Creepers deal 25% more contact damage, Brain of Cthulhu deals 22% more contact damage.
• When 10 or less Creepers are alive, Creepers gain knockback immunity.
• Increased pierce resistance.
• As more Creepers die, Brain of Cthulhu teleports more often.
• Increased knockback resistance in Phase 2.
• Does not despawn in the Corruption.
• When at low health it sometimes fires Blood Geyser projectiles which inflict Burning Blood debuff.
• When at low health it flies in a large loop and dashes at the player every so often.

• Health increased to 12096.
• Contact damage inflicts the Horror debuff.
• The same attack does not happen twice in a row.
• Rapidly circles the player then dashes at high speed.
• Below 33% health it dashes above the player, leaving many shade clouds in a horizontal line.
• Moves faster and takes less time to teleport in Phase 2.
• Gains more attacks as it loses health.
• Below 66% health it flies in a semicircle under the player and summons several enemies.

• Health increased to 20537.
• The Hive shoots more projectiles.
• The Hive tries to ram the player.
• The Hive gains slightly increased acceleration if a Perforator is alive.
• The Perforators shoot more projectiles which also travel quicker.
• Contact damage with Perforators inflicts the Horror debuff.

• Health increased to 5472.
• Summons Bees faster.
• Sometimes summons Hornets.
• Becomes enraged when on the surface.
• Contact damage inflicts the Marked debuff.
• Shoots more stingers at a time.

• Skeletron Hand health reduced to 1170, Skeletron Head health increased to 11000.
• Hands attack more frequently.
• Attacks inflict the Horror and Marked debuffs.
• Head defence is increased by 250 for every hand alive.
• Minions and homing projectiles do not focus on Head while Hands are alive.
• Homing Skulls inflict Weak debuff.
• Respawns both hands at 33% health.
• Slowly gains more speed while spinning.
• Head deals 25% more contact damage.
• Attacks more frequently as health decreases.
• When both hands are gone, Head occasionally leaves a Shadowflame trail, then teleports shooting 3 bolts after.

• Health increased to 24512.
• Ebonian and Crimulan Slime Gods shoot orbs more frequently.
• Slime God Core movement speed is increased.
• Slime God Core inflicts Marked and Horror.
• In Phase 2 the Slime God Core will teleport near and circle the player and shoot abyss orbs.

• Health increased to 21280.
• Movement speed is increased.
• Lasers deal more damage.
• Detached Hungries and Leeches have increased health and damage.
• Hungries inflict Horror and Marked debuffs.
• Leeches inflict Horror Debuff.
• Charges at the player if they are too far away.
• Once reaching 50% health, it fires much more powerful Red Death Lasers.

• Health increased to 42080.
• Gains a new phase at 15% health where it hovers above the player firing 2 waves of ice bombs, then charging.
• Cryogen phases happen at 93%, 76%, 59%, 42%, and 25% health.

• Health increased to 150000.
• Body gains defence bonus which becomes lower as it loses health.
• As it loses health, speed, aggression, and lasers fired increase, and laser firing speed decreases.
• Lasers are not fired in a random spread.
• Piercing attacks disappear after hitting the Destroyer enough times.
• Probes do not drop hearts.
• Will occasionally charge the player.
• Probe-less segments have less defense and fire Scrap Metal.
• Below 66% health, it switches to firing frost beams which inflict Chilled, Glacial State, and Frozen.
• Below 33% health, its will fire up to 2 green lasers at a time which home in on the player according to the player's speed.

• Health increased to 136000.
• Movement speed and projectile speed is increased.
• Every 10 seconds it performs a circle for 3 seconds and then charges at the player, while spinning it summons Aquatic Seekers, Aquatic Urchins, and Aquatic Parasites.
• Contact damage from the head inflicts the Marked debuff.

• Retinazer health increased to 37500, Spazmatism health increased to 44850.
• Phase 2 happens at 70% health.
• Contact damage and Cursed Flames damage increased by 25%.
• Retinazer lasers are more accurate.
• Laser damage increased by 16%, Death Bead causes 20% more damage, rapid fire damage increased by 30%.
• Retinazer enters Phase 3 at 15% health or when Spazmatism is defeated, in Phase 3 Death Lasers are able to home in on the player, and Retinazer can dash, which releases homing missiles that deal 124 damage.
• In Phase 2 Spasmatism breaths Shadowflame which deals 16% more damage than Crused Flames.
• Spasmatism enters Phase 3 at 15% health or when Retinazer is deafeated, in Phase 3 Spasmatism charges more aggressively and gains a chain dash, while dashing contact damage is increased by 10%, and contact damage inflicts the Marked debuff.
• If gravity is reveresed The Twins transform into Phase 2 immediately, Retinazer lasers fire more quickly and frequently, and Spasmatism occasionally fires homing Shadowflame Fireballs that deal 12% more damage than Cursed Flames.

• Health increased to 65600 (524800 after Providence is defeated).
• Summons Brimlings.
• Contact damage inflicts the Horror debuff.
• Movement speed is increased.
• Below 50% health she gains the ability to fire a laser which stays stationary for around 2 seconds and loses the ability to teleport.

Revengeance Mode (Boss Part 2)

• Health increased to 60900.
• Head gains an extra 8 defence for every hand currently alive.
• As health decreases, movement speed increases.
• When spinning, movement speed is increased.
• Prime Cannon fires rockets.
• Prime Laser shoots single lasers and laser circles.
• Prime Saw and Prime Vice are more aggressive and inflict the Marked debuff.
• As arms are destroyed, remaining ones gain more speed and higher fire rate.
• When gravity is reversed speed and fire rate is increased.
• When the head is under 66% health, all limbs are destroyed and the head sometimes spins around the player summoning Probes and is also ale to fire laser circles while spinning
• When the head is under 33% health it will start to fire Martian Missiles while spinning and spin time is reduced by 2 seconds.
• When enraging during the day the Head will heal to 300 health if it below 300.

• Health increased to 82800 (248400 after Providence is defeated).
• Fires Brimstone Lasers more quickly.
• Contact damage inflicts Horror debuff.
• Brothers contact damage inflict Horror and Marked debuffs.
• Attacks and Shooting is more aggressive.
• Below 70% health she charges at the player 2 times after both Brothers are defeated.

• Health increased to 96600.
• Fires seeds that deal 25% more damage and move very quickly.
• When enraged during the day, she slowly regenerates health, when enraged during the night she gains a large defence boost.
• The more tentacles alive, the higher Plantera's defence is.
• Tentacles deal more damage.
• When all Tentacles are dead, Plantera leaves behind clouds of spores which inflict the Marked debuff.
• Enters Phase 3 under 25% health, during Phase 3 she shoots Thorn Balls.

• Siren health increased to 66560, Leviathan health increased to 145120.
• Siren summons a stationary Siren Clone at 50% health and at 25% health which fire water spears at the player.
• Detonating Bubbles and Aquatic Aberrations inflict the Marked debuff.
• Leviathan shoots more quickly.

• Health increased to 195200 (704000 after Moon Lord is defeated).
• Can use any attack regardless of current health.
• Summons Aureus Spawns which home into the player and explode.
• Can jump through tiles.

• Health increased to 92250.
• Fires eye lasers and fireballs more quickly.
• Fists go through walls and inflict the Marked debuff.
• All parts deal 25% more damage.
• Body fires lasers in Phase 2.
• The Head can take damage in Phase 2 and fires explosive fireballs when body is under 44% health.
• Head, body, and fists inflict Broken Armour debuff.
• Body has greatly increased defence in Phase 2, and health is increased to 47250.

• Health increased to 123640.
• Movement speed increased.
• When below 80% health it can dash diagonaly.
• Missile speed increased and create more projectiles.
• Contact damage inflicts the Marked and Horror debuffs.
• Spawns Plaguebringers in Phase 1.
• Spawns more Plaguebringers when enraged no matter what Phase the Plaguebringer Goliath is in.
• Can spawn more Plague Chargers at once.

• Health increased to 111000.
• Invulnerable while transitioning between phases.
• Contact damage and all attack damage increased by 25%, Sharknado damage increased by 50%, Cthulhunado damage increased by 12.5%.
• Greatly increased defence.
• Faster Charges.
• Sharkons summoned by tornadoes have more health.
• Contact damage and Detonating Bubbles inflict the Marked debuff.
• Summons Sharkons and bubbles when spinning in Phase 2.

• Health increased to 283530.
• Contact damage inflicts the Horror debuff.
• Fires more projectiles.
• Jumps more often.
• Drill Missiles are more accurate and fast.
• Stone Pillars have smaller gaps.
• Lanterns fire projectiles more quickly.

• Health increased to 80000.
• Time window to defeat illusions lessens as Lunatic Cultist's health decreases.
• Homing projectiles are faster and more accurate.
• The player takes 15% more damage while Lunatic Cultist is alive.
• Lightning inflicts the Electrified debuff.
• Ice Mists inflict the Frozen debuff for 1 second, the Chilled debuff for 2 seconds and the Frostburn debuff for 4 seconds.
• Clones do not dissapear.
• Ancient Doom's ability to fire darkness balls is buffed.
• Each ritual creates Ancient Dooms.
• Homing weapons ignore Lunatic Cultist while it is performing the ritual.
• Fires 2 Ice Mists instead of 1.

• Health increased to 374080.
• Probes surrounding worms shoot more mines.
• The worm's lasers are faster.

• Hands health increased to 45000 each, Head health increased to 81000, Core health increased to 142500.
• Phantasmal Deathray is quicker in Phase 1 and travels through tiles in Phase 2.
• Moon Lord teleports more frequently.
• True Eyes of Cthulhu perform similar attacks and stay close together.
• Phantasmal Sphere attacks are slightly more spread out.
• While Moon Lord's Core is exposed the player takes 10% more damage.
• Movement speed increased.
• Clots heal 1250 health instead of 1000 health.

• Health increased to 298998.
• Main Guardian movement speed increased.
• Main Guardian deals more damage after other 2 have been killed.

• Health increased to 404000.
• Increased movement speed.
• Phase 2 at 75% health, Phase 3 at 40% health.
• The maximum amount of Draconic Swarmers in Phase 1 is increased to 3.

• Health increased to 800000.
• Healer Guardian is more effective.
• Shoots 2 Holy Rays instead of 1.
• Increases in speed when flying in the same direction.

• Storm Weaver and Stasis Probe movement speed is increased.
• Lightning inflicts the Electrified debuff.

• Dark Energy swarms are increased in numbers, more aggressive, and contact damage inflicts the Horror debuff.
• At 50% health Dark Energies are spawned which are invincible and rotate around their spawn point.
• During laser portal attack, 4 invincible Dark Energies are summoned, if enraged or below 50% health or enraged, it becomes 12.

• Health increased to 712800.
• Increased Lantern and Signus movement speed.
• Lantern contact damage inflicts Marked debuff.
• Contact damage inflicts Horror debuff.
• After teleporting, summons 2 homing Cosmic Mines.
• Being close to Signus darkens the screen.

• Health increased to 792000.
• Increased movement speed, greatly increased movement speed at 10% health.
• Enters Phase 3 at 50% health.
• Spawns more Phantom Spirits.
• Increased damage reduction.
• Phantoms shoot more often.
• Summons Happy Phantom Spirits at 33% health.

• Phase 1 health increased to 1200000, Phase 2 health increased to 2160000.
• Summons the Cosmic Guardian once reaching 60% health in Phase 1, and 2 more once reaching 20% health in Phase 1.
• In final phase, periodically fires God Slayer Fireballs that inflict the God Slayer Inferno debuff, rate of fire is increased at 10% health.
• Gaps between laser walls are more random.
• When laser wall phase ends or the player is to far away, The Devourer of Gods will teleport directly behind the player.

• Health increased to 4040000.
• Teleports and charges close to the player.
• Arena Infernadoes appear 125 tiles away from spawn position.
• Enrage happens at 555 tiles above spawn position.
• Phase transitions at much higher health.

• Health increased to 8800000.
• Movement speed is increased.
• Moves more aggressively.

Death Mode

Death Mode can be activated if the current world has Revengeance Mode active. After opening up your starter bag, you will get an item called Death, which can toggle Death Mode on and off in a Revengeance Mode world. Additionally, this item can be crafted for free at a demon altar. Death Mode is the recommended difficulty for players that have already played through Revengeance Mode.

• Enemy damage boosted by 15%.
• The Nurse will not heal the player while a boss is alive.
• All damage over time debuffs deal double damage.
• Bosses can randomly spawn if certain conditions are met and they have not yet been defeated, the conditions for each boss can be found below.

Bosses will start to randomly spawn once the player has 300 maximum health or more. The first boss on the list that has not been defeated yet and has it's conditions met, will have a 0.12% chance to spawn every second. If a boss has randomly spawned, one cannot randomly spawn again until a 24 minute cooldown is over.

• Eye of Cthulhu - Surface or Space at night.
• Eater of Worlds - The Corruption.
• Brain of Cthulhu - The Crimson.
• Queen Bee - Surface Jungle.
• Desert Scrouge - Desert.
• The Perforators - The Crimson.
• The Hive Mind - The Corruption.
• Crabulon - Glowing Mushroom biome.
• The Destroyer - Hardmode, Surface at night.
• The Twins - Hardmode, Surface at night.
• Skeletron Prime - Hardmode, Surface at night.
• Plantera - Hardmode, Underground Jungle.
• Duke Fishron, Hardmode, Ocean.
• Cryogen, Hardmode, Snow biome.
• Calamitas, Hardmode, Surface at night.
• Astrum Aureus - Hardmode, Surface Astral Infection at night.
• Plaguebringer Goliath - post-Golem, Surface Jungle.
• Profaned Guardians - post-Moon Lord, Surface Hallow or Underworld at day.
• The Dragonfolly - post-Moon Lord, Surface Jungle.

Death Mode changes the way many enemies work as well.

• Slime AI enemies jump higher and more frequently and move more quickly, this is buffed during the Slime Rain event.
• Demon Eye AI enemies have a boosted speed cap, but accelerate slower.
• Fighter AI enemies move more quickly, jumph higher, have more aggresion. Fighter AIs that shoot projectiles are more accurate. Fighter AIs can open doors at any time.
• Worm AI enemies move more quickly, have higher defence, are longer, and can split.
• Swimming AI enemies chase the player more quickly when in water, movement speed and acceleration is increased.
• Flying, Jellyfish, Bat, and Spider AI enemies charge towards the player more quickly.
• Hovering AI enemies hover higher and are more aggressive.
• Caster AI enemies are more aggressive and teleport more often.
• Spike Balls have longer reach and spin more quickly.
• Blazing Wheels are hostile and occasionally shoot a plus shaped flamethrower.
• Granite and Cosmic Elementals move waster but can be hurt while cocooned, but have very high defense.
• Cnidrions can fire water projectiles while moving.
• Diggers, Dune Splicers, Devourers and World Feeders have individual health bars for each segment and split when one is broken.
• Tesla Turrets aim their lasers toward the player's location depending on their velocity.
• Angry Nimbuses move more quickly, scatter ice shards while in range of the player, and have increased attacking range.
• Antlions fire multiple sand blocks at a time, with a chance to fire a large amount of sand at once.
• Goblin Summoners fire more chaos balls.
• Chaos Elementals teleport more often.
• Unicorn, Herpling, and Tortoise AI enemies are more aggressive.
• Spore AI enemies follow the player at all times and more quickly.
• Flying Fish AI enemies have increased maximum speed.
• Plant AI enemies have longer range and charge at the player more quickly.
• Flying Weapon AI enemies spin and charge faster and cannot be knocked out of charges.

Death Mode adds in a variety of new environmental effects which happen in different biomes and circumstances and affect the player in a variety of ways.

• When in the Snow biome during a Blizzard without cold immunity gear, the player will be slowed down, and the slowness will become more intense as they remain in the Blizzard. After 30 seconds have passed in the Blizzard, the player will freeze, then die 3 seconds later. The freezing and slowing speed will occur twice as fast if submerged in water.
• When in the Space biome, the player will be inflicted with Burning during the day, and Frostburn during the night, without heat and/or cold immunity gear.
• While in water in the Jungle, the player is inflicted with Bleeding, which remains for 5 seconds upon leaving the water.
• While in the Underworld without heat immunity gear, the player will be inflicted with a new debuff every 6 seconds in the order of Weak, Slow, On Fire!, Confused, and Burning after 30 seconds have passed
• The Underground and Cavern layers become more dark the deeper the player gets. This is mitigated with light generating gear.
• Abyss light level requirements are increased by 25%.
• Spikes inflict Bleeding for 5 seconds.
• Wooden Spikes inflict Venom for 5 seconds.
• Thorny Bushes inflict Poisoned for 5 seconds in the Jungle, and Bleeding and Weak for 5 seconds in the Corruption/Crimson.
• The Astral Infection has a more intense purple effect on the screen.
• The Astral Infection has decreased gravity on the player.
• Blood Moons boost spawn rate by 400%.
• Lightning Strikes occasionally dealing 200 damage and inflicting the Electrified debuff for 2 seconds.
• Lava Geysers erupt from lava in the Underworld and deal 100 damage.
• Icicles fall from the sky during Blizzards dealing 100 damage and inflicting the Frostburn debuff for 1 second and the Chilled debuff for 0.5 seconds.
• Sharknadoes spawn on the Ocean surface dealing 125 damage and Cthulhunadoes spawn during rain, dealing 250 damage.
• Brimstone Flame geysers erupt from lava in the Brimstone Crag, dealing 100 damage inflicting the Brimstone Flames debuff for 2 seconds.

Death Mode also adds in a couple of unique items that can only be obtained in a Death Mode world.

• Levi
• Cosmic Plushie

Death Mode (Boss Part)

This is a continuation of Death Mode.

Along with enemy changes, Death Mode changes some boss mechanics.

King Slime

• Movement speed increased.
• Teleports more often.
• Crown Jewel appear at the beggining of the fight and stay for the whole fight.

• Accelerates much more quickly and charges more aggresively.

• Charges more often.
• Starts at Phase 2, sub-Phase 4 immediately when summoned.

• Fires sprays of mushrooms more often and summons more Crab Shrooms.
• Crab Shroom walls are always slightly tilted.
• Jumps higher, and always performs double the small jumps in her pattern.

• Always can fire cursed flames.
• Accelerates more quickly.

• Moves more quickly.
• Can teleport closer to the player.
• Can use all attacks at the beginning of Phase 2.

• Moves more quickly.
• Can teleport closer to the player.
• Can use all attacks at the beginning of Phase 2.

• The Hive fires projectiles more often and has increased aggression.
• The Perforators are shorter.
• The Hive will hover closer to the player if more than one Perforator is currently alive.

• Fires stingers rapidly.
• Has faster charges.

• Summons 4 hands which attack at a higher velocity.

• Crimulan Slime God always shoots mines.
• All slimes are enraged.

• Shoots Red Death Lasers from the beginning of the fight.
• Leeches and Hungries have more health and deal more damage.
• Top movement speed is increased.

• More aggressive and projectiles are quicker.
• Transforms into it's different phases at 95%, 80%, 70%, 55%, 40%, and 25% health.
• Fires 4 waves of ice bombs as it travels in final phase.

• Both Twins start in Phase 2 and enter Phase 3 at 50% health.

• Laser attacks can happen in Phase 1.
• Fires projectiles more frequently.
• Projectiles travel at max speed.
• Movement speed is increased and always at maximum in Phase 1.

• More segments and spawn more Probes which have buffed stats.
• Accelerates more quickly.
• Can fire up to 3 green lasers at once.

• Segment count increased by 10.
• Speed and projectile velocity increased.
• Teeth projectiles home in more aggressively.

• Fires skulls when spinning.
• Head inherits all hand attacks at the start of the fight.
• If gravity is reversed the Head gains a speed boost.

• Shoots more aggresively.

• Petal fire rate increased.
• Attempts to ram the player more frequently.
• Top speed and acceleration increased in Phase 2 and Phase 3.

• Siren and Leviathan will be summoned simultaneously and become enraged for the entire fight.
• All attacks are available from the beginning of the fight.
• Siren clones shoot faster.
• The first Siren clone will be created at the beginning of the fight instead of at 50% health.

• No mechanic changes.

• Jumps more aggresively.
• Increased fire rate.

• Starts the fight in Phase 2.
• Missile Barrages and Diagonal dashes are available from the beginning of the fight.
• Stingers are homing.
• Charges at higher speeds.
• Fires additional rockets.

• Starts the fight in Phase 2.
• Missile Barrages and Diagonal dashes are available from the beginning of the fight.
• Stingers are homing.
• Charges at higher speeds.
• Fires additional rockets.

• Projectiles move more quickly.

• Ancient Dooms explode quicker.
• Moves faster while relocating.
• Projectiles move more quickly.

• Worm and laser movement speed is increased.
• Fires more Astral Orbs.

• Projectiles have increased velocity.
• Clots heal for 1500 health instead of 1250 health.

• No mechanic changes.

• Starts the battle in Phase 2.
• Enters Phase 3 at 40% health.
• Maximum amount of Draconic Swarmers in Phase 2 increased to 2.
• Fires a spread of feathers every time a Draconic Swarmer is summoned.

• Healing Guardian heals more quickly.
• More aggressive.
• No longer summons Cocoon Healing Flames while in her cocoon.
• Crystal lasts for less time.

• Damage dealt to tail is multiplied by 3 instead of 10.

• Always fires 12 Dark Energy Orbs.
• Dark Energy gains knockback immunity at 90% health.

• Charges more often.
• Starts at Phase 2, sub-Phase 4 immediately when summoned.

• Enters Phase 2 at 90% health.
• Enters Phase 3 at 80% health.
• Phantom Spirits shoot more frequently.

• Head Contact Damage instantly kills the player.
• The sky stays black for the entire fight.
• Always moves at max speed.
• Switches between passive and aggressive phases more quickly.
• Fires barrages of laser walls from 90% health to 20% health.

• Performs more fast charges.
• More meteors.
• Summons more Infernadoes in place of Flarenadoes.
• Summons more fireballs in Phase 2.

• Arena size is reduced to 127x127.

Armageddon Mode

Armageddon Mode can be toggled on and of with an item called Armageddon, which can be crafted for free at a demon altar. Armageddon Mode is recommended for those who want a more difficult time fighting bosses, or are trying to get a certain item from a boss.

• While a boss is alive, any damage done to the player causes an instant death.
• Bosses drop 5 treasure bags in Normal Mode, and 6 treasure bags in Expert Mode.
• Respawn time is greatly shortened.

Iron Heart Mode

Iron Heart Mode can be activated if the current world is in Expert Mode. After opening up your starter bag, you will get an item called Iron Heart, which can toggle Iron Heart Mode on and off in an Expert Mode world. Additionally, this item can be crafted for free at a demon altar. Iron Heart Mode is only recommended for players who understand boss mechanics and are very comfortable with the game.

• Dying while a boss is alive causes the player's character to be permanently killed, as if they were a Hardcore Character.
• The player's hearts change to a light grey colour, and gain eyes, making them look skull-like.

Defiled Mode

Defiled Mode can be activated if the current world has Revengeance Mode active. After opening up your starter bag, you will get an item called Defiled Rune, which can toggle Defiled Mode on and off in a Revengeance Mode world. Additionally, this item can be crafted for free at a demon altar. Defiled Mode is recommended for those who want a slight increase in challenge or want more loot from monsters.

• Wing flight is disabled.
• All damage sources have a 25% chance to critical hit the player, dealing 50% more damage.
• Some Calamity items with drop rates below 5% are boosted up to 5%.
• Some rare Vanilla items have an additional 5% chance to drop.
• Enemies drop 50% more money.
• Some enemies drop items they would only drop in certain biomes.

Source: https://gameplay.tips/guides/7980-tmodloader.html					

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