The Wandering Merchant

A cheerful merchant who appears to be a hale, middle-aged human man with a handlebar mustache. He wears a white shirt, breeches, and leather apron, and he hauls a towering backpack bursting at the seams. Few know the merchant's true nature and origins, though some theorize he is an immortal being or a god (they are not entirely incorrect). The Wandering Merchant always has something useful, far-flung, or incredible to sell at a reasonable price, and there's no telling when or where he'll show up next...

AC 16, HP 71, ATK 4 +3 vorpal bastard sword +9 (1d10 + lop), MV near, S 3, D 3, C 4, I 3, W 4, Ch 5, AL L, LV 15

Legendary. Only damaged by magical sources. Hostile spells targeting The Wandering Merchant are DC 18 to cast.

Amulet of Rahm-Hotep. In place of attacks, teleport to a random location in the multiverse.

Bottomless Bag. Contains 200 gear slots in magical sub-pockets. Weighs as much as a normal backpack. The Wandering Merchant can summon it to himself from anywhere by snapping his fingers.

Dice of Truth. A set of three six-sided dice whose rolls cannot be magically or mundanely altered in any way.

Lop. On a natural attack roll of 18-20, behead the target.

Reckoning. Any creature who steals from The Wandering Merchant develops a curse. Over the next 2d8 days, that creature turns into a cockatrice. This curse can only be lifted by a wish spell or by returning the stolen goods.

Strange Lands. The Wandering Merchant does not suffer any ill effects from the natural environment he does not wish to suffer.