Cannons are dangerous, if sometimes unpredictable, weapons whose manufacture is limited to Human and Dwarf experts. When they work, cannons can shatter the most determined enemy, pouring deadly shot into his' massed formations, levelling his cities and toppling huge monsters. However, cannons often go wrong. Weaknesses in the casting methods can leave minute cracks or other deficiencies, which cause them to explode when fired, or black-powder can fail to ignite or may explode prematurely. Despite the occasional spectacular accident, cannons are extremely potent weapons that have been instrumental in winning many battles.