Board Thread:General Discussion/@comment-24021597-20131010082115/@comment-34070527-20180224152742

There is an exploit you can use with Turtle Armour, since it has so much Thorns and the Dungeon Guardian having so much damage, simply running into him would kill him. This was later patched by theDungeon Guardian 's damage being nerfed from 9999 to 1000 (2000 on Expert Mode ). However, this is still possible when he spins, since his damage increases to 9999 and his defense drops to 0. Alternatively, you can use Cosmic Car Keys and something that inflicts Frostbite since it is the only thing that does more than 1 damage to him (32 damage per second), building arope / chain circle just above 0 depth, then when he spawns, catch onto the rope and keep going in a circle and throwing a Boomerang / Enchanted Boomerang into the middle, he should get stuck there (Although this is innafective when there is more than one head), or using the Cosmic Car Keys with the Infinite Musket Pouch and the Megashark with Chlorophyte  Bullets