Along with the countless way of leveling up your faction to higher levels in order to obtain that special exotic faction item [spoiler]Level 25 for the faction + Plus a quest line similar to Bad JuJu's[/spoiler] a lot of us have useless item in our inventory that we would like to trade in for XP to go towards the level.
What about planetarium materials spinmetal, worms pores, etc. Even the piles of exotic shards that we don't use that much anymore. These items can go up to about 100 - 250 XP to surely speed up the process quickly. Also the remembered useless items now from HoW could also be traded in for XP.
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We have no need for planatary materials. Why would we reward you for giving us things we dont want?