[ Della blinks at the treasure chest... and yeah, Obvious Trap is Obvious. However, what other option does she have to save Monika? ]

All right, buddy, whatever's in this chest... I have really scary Dark Magic, and I'll put a huge mega evil curse on you if there's not a way to help her in there!

[ It's sort of a bluff, Della's not great at curses, but she leans over and begins to fiddle with the opening... ]