The Ratkin may

improvise explosive devices out of just about any junk she can find to hand; her Rage serves as the fuse and the fuel. This Gift is taught by weasel-spirits.

System: The player rolls Intelligence + Craft to improvise the bomb, and spends as much Rage as desired. When the bomb is triggered (either by being tossed, or through a remote detonation system — the type is chosen at the time it is created), it inflicts (Rage spent x 3) dice of lethal damage to everything within (Infamy x 3) yards.