You need Rohan as a companion and him to have recognised the fungus pods as his creations. To do that you can summon him to inspect the pods in the starting cells. Then all you need is to rest.
Temporarily unavailable ! I'll patch it soon, it will be compatible with saves of the 1.25. Normally you'd need to save Victor from his cocoon, but I messed up the conditions. It's an easy fix but there are a few other bugs I want to fix in the 1.25a