Speak to Phomona about the old book you found in the Manduri Village.
Step 1. Talk to PhomonaA Forest Daeva on the road from Eltnen Fortress to Manduri Forest. The central government dispatched her to revive the dying forest..
Step 2. Talk to FuchsiaA Daeva in the Library of the Sages in Sanctum. She has read every book in the library and retains every word. She refuses to admit how many languages she is fluent in..