Demon Item

Demon items are items dropped by Demon State Bosses, they are very powerful as they are upgrades or work well with expert mode items.

Pre-Hardmode
The Pre-Hardmode bosses would drop the following:
 * Eye of Cthulhu: Axe of Cthulhu
 * King Slime: King's Gel
 * Eater of Worlds: Worm Hat or Worm Gloves
 * Brain of Cthulhu: Brain of Master Mind
 * Queen Bee: Staff of the Bee
 * Skeletron: Bone Gun
 * Wall of Flesh: Demon Gloves and Demon Trophy
 * Dungeon Guardian: Guardian's Heart

Hardmode
The Hardmode bosses would drop the following:
 * Skeletron Prime: Prime Bar (1-20)
 * Twins: Mechanical Eyes
 * Destroyer: Mechanical Worm Scarf
 * Plantera: Vines of Plantera
 * Golem: Fists of the Golem
 * Duke Fishron: True Tempest Staff
 * Ancient Cultist: Cultist Staff
 * Moon Lord: Lunar Heart and Lunar Trophy