As of now, we know that escalation protocol is public event like activity so everyone on planet can join.
But.They are hard. Really hard...
You said its ''ENDGAME CONTENT''
I dont want to run it with some random people without communication, but fireteam limit to exploration is set to 3 so ..... I hope there are changes to this
Hehe, dont tell me you didnt took this into consideration
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Bungie's definition of Hard, isn't. They tried to gotcha the Summit people they invited with this event, having already believed it to be hard, and they even gave the players under-leveled accounts to use. The result was the Summit players having given them the feedback that it wasn't hard enough.