1. Player to player interactions
Like if your new to the game you can pay other players with glimmer to be a guide or protect you
2. Things like auction houses
3. For people that watch sword art online
Swords that aren't abilities
Open world PvP that allows you to loot other players
4. Able to capture people in open world PvP with stuff like handcuffs (almost like DayZ)
5. Open world like DayZ
That's all tell me what you think
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Open world PvP would only be cool if there were factions, we would need bigger maps to prevent camping, and safe zones/towns in the maps. As far as other players dropping stuff upon dying, it would have to be glimmer or something like that. Maybe if someone has X amount of kills and zero deaths they become a high-value target and drop a strange coin upon dying. As of right now the game isn't big enough for something like that.