I suggest new features to the game. Action RPGs are based on farming and collect loot. For this reason I think that everyone would love this staff:
1 - Armory: After a new quest, a building is restore in a town. In this building, a NPC offers you a “museum” of legendary items (shared for every character). Every legendary item can be stocked there. You can find two upsides: you can save one legendary object of each type well ordered and without problems of limits. The second upside: a new objective, gotta catch em all xD
2 - Similar to the previous one, a building with a good interface to collect rare items (Treasures). Not equipment, just rare collectibles to find along the world (like the notes) or looting concrete bosses/areas.
3 - Bestiary. A similar interface idea than the factions, but with each enemy in the game (or just the bosses/champions). Each enemy can have a card that you have to complete killing this kind of enemy several times.
4 - Library. A place to consult your lore notes with an enhanced interface (I suggest the Dragon Age: Origin codex interface for that). Moreover, new lore notes and ¿Legendary ones?
What do you think about this suggestions?