Bungie knows of this poor quest setup give it time im pretty sure they are fixing it. Its like if you were playing WoW and deleted a quest item and had no way of completing the quest or restarting it so no worries its different from dismantling a weapon that you can get back so just be patient.

BUNGIE this game cost me already lots of time and money so the least you can do is make the stupid sword quest replayable, in case you finally read this my gametag is need4speed1994 on Playstation the sword i dismanteld becaus i was stupid was the void sword i din't know that you had to level it up to get the Darkbrinker. now i know that when it too late just need the void sword for my hunter. So Please

Dun goofed. Only way I would say to have a sword at all would be do the exotic sword mission...I mean yeah its exotic so you can only use it with a legendary primary and secondary, but you'll still have a sword:/