|[+] Syrbal Pass
 Occult Knowledge
You need to be at least Level 78 to receive this quest.
You need to be at least Level 72 to turn-in this quest.
Collect the Strange Flask.
This was fixed with patch 22.214.171.12478 on 6/4/2019 and can now be completed.
UPDATE: The flask is in the room where you meet the 5th boss (Maderoth), at the wall on the right side of the exit door (which won't open), but only in Easy and Normal mode. It is not found in Hard mode.