Now this is totally just an idea....
The whole "learn of the Great Oak" is probably Rhizomes baby, and I Certainly dont want to take that away from him.
But....would it perhaps be an idea to.....once in awhile.....place an NPC character of Rhizome at Corax lake for VERY short periods for people to complete the quest and learn of the Great Oak.
Just looking at the job listings under Rhizomes name, Im sure hes a VERY busy person " grievance GM, World DM...ect..." plus Real Life too.
All Im suggesting is....placing an NPC of Rhizome in Corax lake....with Dialogue Rhizome has of course wrote.....for a few hours every once in a while....just to relive the stress of Rhizome actually having to log on for an hour or two every time someone wants to complete the quest.
A few hours a week should do it as...of course....he is a wanderer....and shouldnt be easy to find at all. And of course, I would have thought Rhizome can remove the NPC char when he logs in as Rhizome himself.
Just an Idea....thanks