[It's difficult to grasp and understand this world and how it works, because death is usually a bad thing, but Luca saw Reaper dead on video, and he knows he came back as a squid before returning as himself. Given what he's seen he figures Reaper could very well be right. As for monsters...well, his world might not have monsters in the sense that this place did, but Luca supposes it might have monsters of a sort.]

Yeah...I guess if you mean figurative monsters, every world has those.