[This sure does kinda seem like a trap. So he keeps paused, nodding to himself in thought because Adelina's also from a world of monsters. Duh. It would make sense she'd be one to ask.]

It used to be mine. [For all of maybe five hours...] ...that dagger's supposed to protect anyone who's wielding it from everything and anything. Seems to have worked for its owner so far. Plus it's designed for monsters in particular instead of just a normal blade.