It would be nice if you let us bring as many friends as we wanted into PoE. PoE by its very nature seems like something that would be easy to scale based on the number of people in the party. i think it would be fun to allow people to go into PoE with whatever size party they choose. if you wanted to limit it to 6 or less i guess that would be OK. but i think it would be better if it allowed more than 6.
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I don't think the maps are big enough for more than three players. It might also make it a bit too easy, even if you bump up the enemies health