Boosters are items dropped by bosses when the anti buff is active. They provide a variety of buffs to assist the player.
King Slime: Jump height and safe fall distance are both greatly increased!
Eye of Cthulhu: Provides detection for creatures, traps, and treasures
Eater of Worlds: Melee speed increased by 5%. Movement and mining speed increased by 25%
Brain of Cthulhu: Max amount of minions/sentries increased by 1, the heartreach buff is applied.
Queen Bee: Damage from hostile bees decreased, life regeneration is increased by 6, immune to Poison
Skeletron: Contact damage from skeletons is reduced, damage and crit chance are both increased by 10%.
Wall of Flesh: Max amount of minions/sentries increased by 1, defense increased by 10, and damage resistance by 10%
The Destroyer: Mining speed is increased by 33%, max life is increased by 25%.
Skeletron Prime: Armor penetration increased by 15, melee speed increased by 15%. Also grants 200% Thorns.
Plantera: Damage and crit chance increased while moving. Also grants the effects of the Philosopher's Stone.
Duke Fishron: All stats gain a 4% boost while on the surface. Also makes the Cute Fishron always have his damage and speed boosts, even while not submerged.
Golem: 10% increased attack speed and increases melee knockback.
Lunatic Cultist: Reduces damage taken from pillar enemies, mobs may drop Lunar Fragments
Moon Lord: You emit an aura which weakens enemies around you.
Betsy: Attacks inflict Daybroken, increased flight abilities.
Goblin Summoner: Attacks inflict Shadowflame and gives immunity to it.
Ogre: Defense is increased by 5 and damage resistance by 5%, provides knockback immunity.
Pigron: Provides Well Fed.
Dark Mage: Greatly increases mana regeneration. Magic damage by 25%, max mana by 50
Custom 2: Provides immunity to fire blocks, provides the Obsidian Skin, Gills, and Flipper buffs. It is made by combining the broken booster 2, 30 Obsidian Skin, Gills, and Flipper potions, 8 Crimtane/Demonite bars, and 15 Shadow Scales/Tissue Samples on any anvil.
*Broken Booster 1 Dropped by Eye of Cthulhu.
*Broken Booster 2 Dropped by Skeletron.