Grenades
Source Player Core pg. 280
An item with the grenade trait can be thrown with a range of 70 feet using the Area Fire action as though it had the area (burst) trait at the listed radius using a single action instead of two actions. Grenades are simple thrown weapons that are expended when used. If you apply the critical specialization effect of grenades, apply the grenade's listed effect to each creature that rolls a critical failure against the grenade's effects. Unlike most weapons, grenades can bounce off a solid surface (not a creature) once without exploding. This allows for grenades to move in a straight line toward a solid surface, then move up to their remaining distance in another straight line from that point, potentially even bouncing out of line of sight.