The Brain of Cthulhu no longer despawns outside of the Crimson but becomes extremely aggressive in Revengeance Mode.
The Brimstone Elemental and her projectiles are now significantly slower and inflict Brimstone Flames instead of Abyssal Flames. The brimstone laser now shoots rows of darts perpendicular to it. Now inflicts Brimstone Flames for 3 seconds on contact. Hellfireballs and their explosions now only inflict Brimstone Flames for 4 seconds instead of 10 and 6 respectively.
Calamitas now only inflicts Brimstone Flames for 2 seconds when the player is hit by the Brimstone Laser. Hellfireballs and their explosions now only inflict Brimstone Flames for 4 seconds instead of 10 and 6 respectively.
Catastrophe's fireballs now inflict Brimstone Flames for 2 seconds instead of 3.
Ceaseless Void Dark Energies now spread out further apart from each other. Decreased how long Dark Energies inflict the Distorted debuff from 1 second to 0.33 seconds.
Cryogen can now always be seen during its last phase and its projectiles are now blue during the day.
The Desert Scourge no longer becomes invincible and instead enrages when leaving the Desert.
The Destroyer segment lights now glow purple while it's flying in Revengeance and Death Mode. The Destroyer will now accelerate much faster and have a higher top speed if the player is far away. The Destroyer now enrages during the day in Revengeance and Death Mode.
The Devourer of Gods can now charge directly at the player during phase 1.
The Devourer of Gods can no longer teleport immediately after laser walls have been spawned and will now teleport 3 seconds after in all world difficulties.
The Devourer of Gods' top speed has been decreased by 15% in phase 2 on all world difficulties. However, it will now accelerate much faster and have a higher top speed if the player is far away.
Cosmic Guardians will now accelerate much faster and have a higher top speed if the player is far away.
The Dragonfolly now has a slightly longer delay before dashing.
Duke Fishron now gains new charging patterns as its HP decreases during phase 3 in Revengeance Mode and higher. Duke Fishron will also now continuously charge towards the player when its HP is below 20%.
A few changes have been made to the Eater of Worlds fight in Revengeance Mode and higher:
Is now less aggressive when fought in the Underground Corruption.
No longer despawns outside of the Corruption but becomes extremely aggressive.
Total size bonus in Death Mode has been reduced.
Hive Blobs will now despawn and no longer spawn in phase 2 during the Hive Mind fight.
The Hive Mind now enrages outside of the Corruption.
The Hive Mind now is less aggressive when fought in the Underground Corruption.
The Moon Lord Phantasmal Eye projectiles are now less aggressive in Revengeance and Death Modes at the start of the fight and become more aggressive as Moon Lord's HP decreases.
The Old Duke now spends less time preparing to dash during phase 3 and now dashes more aggressively while enraged instead of becoming invulnerable.
Significatly decreased The Old Duke pre-charge velocity and acceleration.
The Perforator Hive now fires its projectiles less often while a Perforator worm is alive.
The Perforator Hive and its worms now enrage outside of the Crimson.
The Perforator Hive and its worms are now less aggressive in the Underground Crimson.
The Perforator worms now move slower but gain speed as their HP decreases.
The large Perforator worm will now lunge at the player less often in all world difficulties.
The Plaguebringer Goliath's enrage has been adjusted to make the fight fairer and now only enrages outside of the Jungle.
A few changes have been made to the Revengeance Mode Plantera fight:
Spore clouds now glow and now constantly travel at a small speed to hinder the player.
The number of tentacle hooks that can be summoned at once has been capped in both phases.
Polterghast Clone now turns invisible, except for a red glowmask for its heart and veins, to convey that it's not dealing contact damage while it lines up for a charge.
Providence Molten globs now only last for 15 seconds on the ground instead of 20 seconds.
Providence Holy Spears can no longer slightly home in on the player.
The amount of Providence Holy Spears that are summoned now scales with how much HP she has, the more HP she has, the more Holy Spears are summoned.
Providence screen shader now gradually grow brighter when the player gets within 20 tiles of her Holy Inferno debuff distance. The screen shader is at max brightness while the player is too far away from Providence and will be inflicted with the Holy Inferno debuff.
Providence at nighttime now fires 4 lasers during her scissor laser attack.
Queen Bee’s enrage scale had been reduced from 0.5 to 0.25.
Ravager Rock Pillars will now break on contact with the player. Ravager's Flame Pillars now spawn further apart in phase 2.
Ravager detached head now stays further away from the player in all difficulties to prevent cheap shots.
Ravager Rock Pillars now will explode with gores instead of clouds of dust.
The Amalgam, Amalgamated Brain, and Rotten Brain projectiles no longer can pierce through enemies.
Nerfed Amalgamated Brain, damage boost decreased from 12% to 10%.
Decreased post-Cryogen Angry Dog damage from 84 / 168 to 60 / 120.
Buffed Aorta, Yoyo range increased from 13.75 to 16.25 tiles. Now additionally fires a blood projectile while the Yoyo is held out that deals 25% of the weapon's base damage.
Decreased Astrum Aureus HP from 96,000 / 153,600 / 195,200 to 84,000 / 134,400 / 171,200. Post-Moon Lord HP reduced from 704,000 to 624,000. Boss Rush HP reduced from 8,400,000 / 13,440,000 / 13,440,000 to 7,400,000 / 11,840,000 / 11,840,000.
Adjusted Aureus Spawn stats. HP increased from 1,008 to 3,000. Boss Rush HP increased from 1,002 to 30,000. Defense increased from 0 to 10. No longer has 99.9999% damage reduction.
Rebalanced Biome Blade, base damage decreased from 70 to 38, use time increased from 23 to 29, knockback decreased from 6 to 5, static debuff duration decreased from 3 seconds to 1.5 seconds (1.5 seconds to 0.75 seconds for Glacial State). Its projectiles within the Jungle biome now inflict the Venom debuff instead of Plague. Rarity decreased from Light Red to Orange.
Reworked Bloodflare Core, no longer grants bonus damage, defense, and damage reduction based on player health. Now removes up to 50% of the player's defense each time they are hit and regenerates it shortly after. Each time the player regains a defense point, they are healed for 1 HP.
Buffed Brimlash, split projectiles now home in much faster onto enemies.
Decreased Brimling HP pre-Providence from 4,000 to 2,000.
Broken Water Filter effects are now togglable by favoriting/unfavoriting the item.
Cloud Elemental no longer gains increased stats after defeating Providence.
Buffed Cnidarian, base damage increased from 13 to 18. Yoyo range increased from 11.875 to 15 tile, seashell projectile damage increased from 50% base damage to 75% base damage. Air time decreased from 7 to 3.5 seconds. The yoyo now moves and fires twice as often.
Rebalanced Core of the Blood God, removed old Bloodflare Core inherited effects. Now increases all damage and damage reduction by 8% at all times while equipped.
Nerfed Corpus Avertor, base damage decreased from 140 to 98. Decreased damage bonus derived from missing player health from 20% to 10%.
Nerfed Crescent Moon, homing moon spawns now deal 18% of the weapon's damage instead of 40%. The Old Duke's resistance to the main flail is reduced from 80% to 45%.
Cultist Assassin money drop increased from 2 to 10 .
Buffed The Devourer of Gods lore item, now decreases player's damage reduction by 5% instead of 10% while favorited.
Buffed Dimensional Soul Artifact, now decreases the player's damage reduction by 15% instead of 25% while equipped.
Decreased Draedon's Remote health scaling for Skeletron Prime from 1.9x to 1.45x.
Eidolist no longer gains a health boost in Death Mode.
Nerfed Energy Staff, decreased sentry fire rate by 33%.
Buffed Fault Line, Yoyo range increased from 18.125 to 26.25 tiles.
Buffed Frequency Manipulator, total charge consumed per-use has been decreased by 68% and prevented its charge up from being interrupted.
Buffed Galactus Blade, base damage increased from 110 to 135 and increased raining projectile velocity by 25%.
Buffed The God's Gambit, the yoyo now moves and fires twice as often.
Revengeance Mode Golem body HP reduced from 54,000 to 47,250. Phase 2 head HP increased from 20,625 to 28,050.
Nerfed Grand Guardian, explosion damage now decreases by 20% on each subsequent hit.
Nerfed Heart of the Elements, damage boost decreased from 8% to 5%. The player will still receive an additional 2% damage boost (+7% in total) while the Elemental minions are disabled.
Lacerator no longer randomly grants 1 HP to the player upon hitting an enemy and now functions similarly to Bloodfire Bullets, grants +2 life regeneration upon hitting an enemy, life regeneration resets after being hit by an enemy, caps at 60 seconds.
Buffed Oblivion, Yoyo range increased from 22.5 to 25 tiles. Laser damage increased from 25% base damage to 50% base damage. The yoyo now moves and fires twice as often.
Nerfed Omega Biome Blade, the projectile range has been decreased.
Buffed Pandemic, Yoyo range increased from 21.25 to 28.125 tiles. Seeker damage increased from 50% base damage to 75% base damage. The yoyo now moves and fires twice as often.
Decreased the medium Perforator worm total health from 2,000 / 3,906 / 4,912 / 5,526 to 1,600 / 3,122 / 4,016 / 4,518. Individual segment health decreased from 200 / 279 / 307 to 160 / 223 / 251.
Relic of Resilience now has a five second cooldown before another Artifact of Resilience can be summoned after the previous one shatters.
Buffed Riptide, Yoyo range increased from 11.25 to 13.75 tiles. Air time decreased from 7.5 to 3.75 seconds. The yoyo now moves and fires twice as often.
Rebalanced Samurai Badge, no longer grants a static 20% melee damage boost and no longer reduces the player's health by 25% while equipped. Melee damage, melee swing speed, and true melee damage boosts are now dynamic and scale with how close the player is to an enemy, the maximum boost attainable is 30%. Still provides a 20% true melee damage boost.
Decreased Sand Tortoise damage from 110 / 220 to 70 / 140.
Buffed Shimmerspark, Yoyo range increased from 17.1875 to 21.875 tiles. Air time decreased from 16 to 8 seconds. The yoyo now moves and fires twice as often.
Silva Horned Helm set bonus now grants the player a 10% ranged damage boost once Silva Invulnerability has ended. This effect is permanent until the player dies.
Silva Horned Hood set bonus no longer grants the player +2 minion slots once Silva Invulnerability has ended.
Both of the above changes are inherited by the Auric Tesla armor set bonuses' corresponding headpiece.
Skeletron Hand HP in Death Mode reduced from 1,170 to 1,014.
Skeletron Prime HP in Revengeance Mode reduced from 60,900 to 50,400.
Some changes have been made to The Slime God's fight.
Decreased Core HP from 4,000 / 6,400 / 8,000 to 2,000 / 3,200 / 4,000.
Decreased the duration of Distorted inflicted by the Core from 3 seconds to 2 seconds.
Increased Crimulan Slime God HP from 3,500 / 5,600 / 7,712 to 4,150 / 6,640 / 9,120.
Increased Ebonian Slime God HP from 4,000 / 6,400 / 8,800 to 4,650 / 7,440 / 10,240.
Increased Ebonian Split HP from 1,000 / 1,600 / 2,200 to 1,350 / 2,160 / 2,880.
Reworked Staff of the Mechworm, now summons a mechworm that charges, fire lasers, and teleports onto enemies. Its damage can be further increased by summoning additional segments that require and occupy minion slots.
Rebalanced Sulphurous Grabber, Yoyo range increased from 18.75 to 21.875 tiles, bubble projectile count decreased from 9 to 7, bubble projectile damage increased from 20% base damage to 25% base damage.
Buffed Terrarian, base damage increased from 190 to 380.
Buffed Time Bolt, split projectile targeting distance increased from 25 to 62.5 tiles.
Buffed Trinket of Chi, decreased how much time the player needs to stand still from 2 seconds to 1.
Rebalanced Verdant, Yoyo range increased from 25 to 35 tiles, and increased projectile fire rate by 25%. Base damage decreased from 128 to 110, leaf projectile damage increased from 60% base damage to 80% base damage. The yoyo now moves twice as often.
Buffed Void of Calamity, now decreases player's damage reduction by 10% instead of 15% while equipped.
Buffed Yharim's Insignia, increased melee damage boost from 5% to 10%.
Buffed Yin-Yo, Yoyo range increased from 17.1875 to 21.875 tiles. Light Shards travel away from targets instead of downwards. Dark Shards travel towards targets instead of the right. Air time decreased from 14 to 7 seconds. The yoyo now moves and fires twice as often.
Buffed Yoyo Counterweights, counterweight projectile velocity increased by 200% and now use custom immunity frames.
Astrum Aureus makes laser fire noise when stomping now.
Breath meter loss in the Abyss now only starts when entering the second layer of the biome, and instead uses the standard breath loss mechanic from vanilla Terraria.
Biome Blade's rarity is reduced from Light Red to Orange.
Bloodworms now have an increased spawn rate after encountering The Old Duke for the first time.
A few changes have been made to Death Mode:
The player can no longer be affected by the Space biome Death Mode effects if they are behind Walls.
Artificial darkness has been made easier to counter through light sources and potions. Artificial darkness is now disabled while any boss is alive.
Amplified debuff damage modifier has been decreased from x2 to x1.5.
The Devourer of Gods now has a npcSlot check prior to being summoned. If the check fails, The Devourer of Gods cannot spawn.
Dimensional Soul Artifact now specifies it increases all damage taken in its tooltip.
Nerfed Folly Feed mount, top horizontal speed decreased from 94mph to 72mph and decreased mount acceleration from 20%/s to 13%/s.
Minimum damage taken in Iron Heart mode decreased from 60 + 10% of max life to 40 + 10% of max life. Minimum damage is no longer affected by damage reduction.
Obsidian Skin Potions cause the player's lava immunity timer to regenerate much faster if they are not in lava.