Fixing the mind of Planth

Joe's character has serious issues with wisdom after losing his mind. He would do anything to try and get it back.
Options:
1- The hags in the bathhouse offer to return his wisdom and memories in return for accepting a contract
2 - The party hunt down a creature that is well versed in psionics and utilise it to try and return some of his memories
3 - Return to his workshop and figure out what experiment he was doing
Update
Joe is wanting to write some experiment options for session 3 and so I'll be able to write in whatever he would like for his character