When creating expedition it would be nice to place one legendary item in exchange from ONE buff to be picked, example (if player place 5 legendary maybe it could get all these buffs - so it's a farm/profit stuff and it would give more reasons to drop more crap legendary and to keep them):

+10% all resistances.
+10% force shield
+10% damage
+30% speed
+10% ailment damage
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So you would give more reasons to celebrate when we drop crap legendaries instead selling them on npc or just dropping back on ground.