GoldenTrapper
Skeletron Prime
Just for an addition, they also spawn in the hallow. Those are the only places where they can spawn. When you fight The Profaned Guardians if you are out of the hallow or the underworld they will have lots of defense. If you fight Providence out of any of those two biomes she will be immune to any attacks. Also, Providence drops different Expert Mode items depending in which biome you kill her. I know it's more information than needed but I thought it would help.Yeah they both spawn in the Underworld. I had this feeling that they would, and faced a couple of them when i got there. But thanks! And thanks for the wingman too, will gonna try to spawn a martial invasion to check that out.