The Forge of Solus Prime was a very large hammer that had the mystical ability to infuse raw material with working mechanisms. Solus Prime used this device in her mission as the primary weapon-smith of the Thirteen. She also presumably used this device in combat. The Forge is very mystical in nature and can only be wielded to its full potential by a Prime. Although others may use it, to them it would only be useful as a large hammer. Without the power of a Prime the device cannot be used to create anything.