The rapier is able to be smithed at level 93 Smithing, using 2 promethium bars. The only other way to obtain this item, without smithing it or obtaining it from other people, is to obtain it as a drop from Har'Lakk the Riftsplitter, from a level 178 skeleton wielding a shortsword, from a level 130 ice warrior, or from a forgotten warrior visibly wielding the rapier or its primal counterpart.
Promethium rapier on ase Dungeoneeringissä. Se vaatii 90 Attackin.