i havent seen much discussion about this but i would love to see at least some element of PvP like your group encounters another group and theres a fight then at the end theres two great guns and an impressive looking scope your group (of three) and their group
(also of three) v=can either divide it up or beat each other to near death and the winner takes it, now i say near death because guardians wouldn't want to kill each other but to weaken them to the point where they would have to fall back would be pretty fun
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Bungie has confirmed that there will be PvP play.