You can create, detect, disarm, and safely dispose many types of bombs. At higher levels, you are experienced with depth charges and land mines. Bombs that are wired to explode requires an electrical background. Complex chemicals will require a combined roll with Chemistry. You'll likely need many Science skills to back up this difficult discipline.
In ancient times, this is often just subtle applications of black powder and other basic chemistry. Substances like wax, gunpowder, and anything flammable can be jury-rigged to make primitive traps.
In modern times, there are many applications ranging from proximity mines to missile payloads. If it explodes, you understand it. You can measure the range, the overlap between charges, and estimate the effects on the area given the dimensions, materials, and type of explosive being used. Combined with Visual Arts, you can set the stage for a brilliant setpiece.