Terraria Boss Progression Checklist

Slime Crown or random spawn in outer thirds of map

Suspicious Looking Eye at night, or random spawn with ≥200 HP

3× Worm Food in Corruption, or break 3 Shadow Orbs

Bloody Spine in Crimson, or break 3 Crimson Hearts

Abeemination, or break a Larva inside a Jungle Hive

Speak to the Old Man at Dungeon entrance at night

Deer Thing in Snow biome at night

Throw Guide Voodoo Doll into lava in the Underworld

Gelatin Crystal in the Hallow

Mechanical Worm, or random chance at night after WoF

Mechanical Eye, or random chance at night

Mechanical Skull, or random chance at night

Destroy a Plantera's Bulb in Underground Jungle (after all 3 mechs)

Lihzahrd Power Cell at Lihzahrd Altar inside the Temple

Fish with a Truffle Worm in the Ocean biome

Prismatic Lacewing at night in the Hallow

Defeat the 4 Cultists at the Dungeon entrance after Golem

Spawns automatically during Lunar Events

Spawns automatically during Lunar Events

Spawns automatically during Lunar Events

Spawns automatically during Lunar Events

Automatic after all 4 Lunar Pillars are destroyed