This. Vendors that sell items besides weapons and armor such as upgrade materials. One for one swap of relic iron for spirit bloom, maybe a two for one swap would be better. I have lots of spirit bloom because I like the environment on Venus. Two for one swap would be a little better than one for one probably. Also include weapon parts, plate steel, etc. I have upgrade materials for titans and hunters from breaking down their gear as I don5 have much interest in leaving another character. I already run those stories more than once anyway...because rep and marks.