Bore-bang
this explosive device was created by the Old Republic military, and saw heavy used during the Clone Wars. The bore-bang was ostensibly a long, red tube that was filled with high-yield explosives. However, when it was held next to the ground and the end cap was removed, the bore-bang began to burrow its way into the ground. They could be set to go off with a certain time-delay, allowing them to get several feet belowground before exploding. The resulting explosion tore up huge chunks of earth as well as any being or droid on top of it. In addition to any injuries sustained in the initial blast, a being was then pummeled with falling debris.