Terraria Community Forums

Does it kill you then teleport to your spawn and kill you a few more times just in case?

Expert Mode Dungeon Guardian. 999,999 HP, 999,999 defense. Can now only be damaged by a Broken Copper Shortsword. Flys 5x as fast as before. Now will spawnkill you and your NPC's until it is dead.
Drops Dungeon Guardian Mask which is literally just a renamed Skeletron Mask.