terrible,

Plot Twist, because I’m an asshole: the massive treasure chest at the end of a murderously difficult and expansive dungeon is entirely empty. Inside the box there is some flowery prose that hints at friendship or something being the “true treasure.”

Subsequent Plot Twist, because I’m an even bigger asshole: the chest itself is actually a long-lost non-magical artifact with massive historic value, and there are plenty of museums, nobles, historical societies, etc. that would pay an insane amount of money for it.