Worm Fodder

The Corruption's boss. Summon by smashing three Shadow Orbs (Smashing, Poppet!) or crafting Worm Food (30 rotten chunks + 15 vile powder at a Demon altar). It's a segmented worm: piercing weapons (Vilethorn, jester arrows, flails) carve through multiple segments at once and trivialise it. Fight in a cleared chasm bottom. Demonite + shadow scales build your next gear tier. Crimson worlds get Mastermind instead - world evils are one-per-world, so bagging both means a second world.