Rogue Thief with Charlatan background. Specializing in deception and sleight of hand.
He just used items without anyone noticing. He may have some cantrips from his race/feats or a magic item like his staff.
Most of what he did was off screen, he deceived everyone all the time take.
Flash of light, whip out magical trinket while everyone is blind.
Flash of light, dash and take off running or use stealth, so others think you are invisible or teleported away.
Who knows maybe the Balrog was in on it. Deceived him to help him out. Make him seem more awesome after his "victory".
Maybe, just maybe the whole thing with the ring is a huge scam. Maybe he is just so good at deception that he convinced multiple people that it was all real. He had the whole world dancing on his palm. It didn't matter who did what, he could take credit because in truth it really was because of him. Maybe it was a prank that got out of hand. Damn I can see it now he started this whole thing because of his psychedelic drug addiction. Maybe he is so good a deception that he even deceived himself.
Puff Puff, "Yes I can see it now, an eye, big ass chickens, and butterflies. Invisible hunters, and lots of short people." Puff Puff, "Big ass bats that the invisible people ride. Oh and elephants but bigger." Puff Puff, "Prideful but cowardly elves, Let the world rest on the shoulders of some random fool to make it interesting. Hmm, hmmm need dumb leaders so it doesn't end to quickly." Puff Puff, blows out a ring of smoke while grinning like an idiot. "Ohhhh rinngggssssss, yes yes rings."
Wow now that was a rabbit hole, I need sleep.