I still think we're in something of an apples to oranges discussion, but you do make a fair point so I'll provide a feat.
I am going to go with Gandalf's most famous. Fighting the Balrog. He fought that thing while falling several miles. Survived the impact at the bottom. Continued to fight with the thing for several days (I don't remember how long exactly. The movie doesn't state exactly and I'd have to look it up in the book). Finally managed to killed. Died of exhaustion. Hung out in heaven for a bit and realized, "Crap I those dumb-asses are lost without me" stuffed his soul back in his dead body. Healed and rejuvenated it stronger than before.
The Balrog is (well was) an immortal. It was so old that it was actually a servant of Morgoth (the Dark Lord that ruled, before Sauron ever came to power) was capable of wielding power magic if needed, and wielded weapons of living flame which Gandalf was able to survive being struck by repeatedly.
Now I only read the books and saw the movies each one a piece so I'll concede if I am wrong, but I don't recall Voldemort or any of the Deatheaters having any feats comparable to that.