You started playing destiny with the taken king didnt you? Lol House of wolves had a "reforge" feature that allowed players to reroll any legendary weapon at the gunsmith or lord saladin. The cost of reforging was some glimmer, motes and weapon parts. Alot of players would sit and reroll weapons until they got the "perfect" roll, also known as the god roll. This for some was quick and believe me lucky. For most though it chewed up all of thier motes and weapon parts and even then they may not have gotten the roll they were looking for. This feature is all but gone but the aftermath (lack of parts) still lingers.