Sticky Dynamite

Plain dynamite rolls. That sounds like a small thing until you are trying to open a ceiling or blow into the side of a shaft and the charge keeps sliding back to your feet. This version stays exactly where it landed, which turns vertical digging and precise arena carving into something you can aim instead of guess at.

The same property works against you. A bad throw at a nearby wall leaves a live charge an arm's length from your face with no chance of it rolling clear, so throw downward and keep moving after the release. If the block it is clinging to gets destroyed first, it falls and grabs the next surface below, which can drop a charge much deeper into a shaft than you meant.