I have level 20 fighter doing the adventures. Currently in the Chasm adventure. Prior to patch, had the Collect Warped Magics quest but cannot get access to Quorthon.
I'm having the same problem (PS4). I had a different Chasm quest to collect artifacts and couldn't find any sparkly things. So I abandoned the quest. Then it sent me to find Quorthon but He doesn't exist. Now the quest doesn't exist in my Journal and I can't abandon it. The quest chain is stuck.
I ended up taking the long route in going past the Precipice to reach Quorthon. Once I got there, was able to interact with Quorthon and continue the quests.
For anyone else with this problem, you can go the the end of the map where there is a portal. Take the portal and it will lead you to Quorthon where you can continue the quest.
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For anyone else with this problem, you can go the the end of the map where there is a portal. Take the portal and it will lead you to Quorthon where you can continue the quest.