The Dungeon Guardian is a miniboss from Terraria made to prevent the players from acquiring powerful loot early on,the only way to encouter it is to go into the dungeon at 0 or lower depth only if skeletron is NOT killed on that world yet(The Dungeon Guardian has 9999hp normal mode and can instantly kill you)
Guy 1:Dont go into the dungeon yet or you will die by the dungeon guardian!
Guy 2: The what?
*Dungeon Guardian spawns*
Guy 2: OH FUCK
*Guy 2 dies to the Dungeon Guardian*
Guy 1:*faceplams*