Skeletron (Terraria)

Skeletron is a Pre-Hardmode boss. It must be defeated before traveling through the Dungeon. It is immune to the Poisoned, On Fire!, and Cursed Inferno debuffs.

Defeating Skeletron grants unlimited access to all Dungeon areas for all players. It also causes the Clothier NPC to spawn, as long as a vacant House is available.

If attempting to enter the Dungeon before killing Skeletron, Dungeon Guardians spawn once a player reaches 0 depth. These enemies generally kill any player with a single hit, dealing 1000 / damage. Managing to defeat a Dungeon Guardian does not grant access to the Dungeon, thus defeating Skeletron is mandatory for entering the Dungeon.

While Skeletron is alive, music Boss 1 will play.