So I was doing this week's ascendant challenge with my friends. We reached the end and I was killed by a shrieker as I was too high up. When I spawned, I wasn't able to go back in, even after logging out and trying to join them again. It didn't even count it towards my contract. Please fix this now as it has happened to me twice already and it's really frustrating.
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Nothing to fix, you failed the challenge. Until you spawn the boss you can go back in as often as you want. Soon as that boss appears the portal closes and you can't die. You'll have to run it again.