Saeviomagy
Adventurer
Paladins are good at fighting undead. They always have been. I would expect a lone paladin with stats and equipment like that, up against a lone death knight would make mincemeat of the creature in most editions.
Shoop in a second rapier, and that's my current character.
(Oh, and if someone actually does so, could you p,ease also shoop in a a pet owl?)
When you stare into the abyss long enough, Shmazzengest Wegwuangni stares back at you.
Paladins are weak to ranged attacks and mobs. A small army of skeletons with slings can do a number. Doesn't mater if they drop in 1 hit, he can only hit 2 per turn. Also toss in some radiant resistant golems, as well as maneuverable ghosts that can do fly-by-night attacks. And of course, let a few things for him to smash and feel powerful against.