Me and a few friends managed to juggle a sword up to where the gatekeepers spawn and kill 3 of them before the sword runs out. I also made a guide on how to get where i go. message my GT ELQUAIDOREBORN if you have any questions
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Three gatekeepers at once happened to my group as well when we got the sword then dropped it and re picked it up. After we killed like 6 gatekeepers they stopped spawning for us anyway.