"It's a sort of portable bomb," Jim explains, since they're doing the cultural knowledge exchange thing. Seems only fair that he should elaborate on something Shade-Seeker is unfamiliar with. "Early types were pretty much confined to concussive force and shrapnel, but these days they make grenades with different effects, like incendiary or stun. They pretty much all work the same for deployment; you activate it and throw or roll it into a group of enemies, and it goes off a few seconds later."