The main idea behind Armaments is the creation of weaponry made from the energy and matter of Merge Modes that use the abilities and traits of said Merge Modes. Again, a lot like what Skurd did in Omniverse but yes the Armament ability can allow Fusion-X to use the limbs and weapons of other Merge Modes as a Merge Mode or even as Nicholas himself, kinda like how Skurd gave Humoungasaur Armodrillo’s arm that one time.