PRE-HARDMODE

• King Slime → slime rain; slime crown
• Eye of Cthulhu → suspicious looking eye
• Eater of Worlds → every third Shadow Orb is broken; worm food (Corruption)
• Brain of Cthulhu → every third Crimson Heart is broken; bloody spine (Crimson)
• Queen Bee → destroy larva; Abeemination (jungle)
• Skeletron → speaking to Old Man NPC at night
• Wall of Flesh → Guide Voodoo Doll (underworld)

HARDMODE

• mechanical bosses
  • The Twins: Spazmatism and Retinazar → mechanical eye at night
    • The Destroyer → mechanical worm at night
    • Skeletron Prime → mechanical skull at night
• Plantera → destroy Plantera's bulb after all three mechanical bosses
• Golem → Lihzahrd power cell (jungle temple)
• Duke Fishron → truffle bait (ocean)
• Lunatic Cultist → killing four cultists after Golem
• Moon Lord → defeating all four of the celestial towers; celestial sigil

EVENT BOSSES

• Pumpkin Moon: post-Plantera Halloween-themed event
  • Mourning wood
  • Pumpking
• Frost Moon: post-Plantera Christmas-themed event
  • Everscream
  • Santa-NK1
  • Ice Queen
• Pirate Invasion: hardmode event
  • Flying Dutchman
• Martian Madness: hardmode post-Golem
  • Nartian saucer
• lunar events: late-hardmode post-lunatic cultist
  • Solar Pillar
  • Nebula Pillar
  • Vortex Pillar
  • Stardust Pillar
• Old One's Army: Dungeoun Defenders 2 crossover event
  • Dark Mage
  • Ogre
  • Betsy