The Last Faith

You find Aldrich in the extended part of Mythringal that connects going through the Site Cave. Once you find him you can send him to the Manor. He will be on the second floor right side of the manor. He asks you to help him find more knowledge so he requires a book/tome. You wont be able to fufill this quest until you get the Celestial Larva Double Jump. You can find the book he requires in the far north-west of Ordens Regnant Palace its the Tome Of Oisak. Return this to Aldrich ASAP and then return here and take the elevator to the left of where you found the Tome to the middle section and go east to the outside area and you will need to kill one enemy here for a magic spell. This enemy only appears after returning the Tome to Aldrich. Once you return the tome to him this will unlock.