If at least 3 people were in your fireteam when you did gatekeeper, then the opening will be there. The op is trying to solo it though. Also that's a good idea for when the minotaurs come out, but how are you supposed to get both relics by yourself?
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What i did was get the first one, took it into the second room, did that super blast, gally or 2 and it died, then blindly kept swapping them out the door a little at a time, actually a minotaur sacrificed before i got out because it took so long lol and btw yeah some other kid showed me the atheon solo, didnt know it was possible but idk maybe soloing the maze was a glitch for me because i did this on a day my friend and cousin i raid with were working late and was 100% by myself until atheon where i had people stand there for me