If attempting to enter the Dungeon before killing Skeletron, Dungeon Guardians spawn once a player reaches 0 depth. Additionally, in the Desktop version, Console version, and Mobile version, defeating Skeletron also causes Old Shaking Chests to rarely spawn in the Caverns layer, and, upon unlocking the chest with ⚷ Open / Activate while the player has a Golden Key in their inventory, releases the Elder Slime town pet. Defeating Skeletron for the first time grants unlimited access to all Dungeon areas for players within the current world and allows the Clothier NPC to move into an available vacant house. Not to be confused with the Skeleton, an enemy found underground, or Skeletron Prime, the Hardmode version of Skeletron.
