I'm not sure what this looks like in the fiction, that is, what is the nature of a trap that is lethal enough to deal 7 hp damage but not more.if the hostile neighbors/invaders are kobolds, my traps need to be low, and "lethal" enough to inflict about 7 damage... which isn't a threat to most adventurers after 1st level, but in this case, I wasn't trying to kill adventurers!