on silver they are minimum of level 26. the levels will depend on your character level and the amount of survival bonus you have. I have run the silver camp and killed them at level 35 before. but they can be really tough.
yeah, I agree. on my first character, a totally botched Shadow Warrior that I have since deleted, I was on silver and I founf once I got to the sections where the Temple Guardian Elites started showing up they'd smash my health down low enough for it to make that öh crap"sound effect that it does far too many times to count. mind you, it was again a botched character that I started before I was aware this site and the wiki even existed and I was a total noob at it too haha. even now, ill occasionally get smashed up something fierce by them, not enough to die though thankfully.