You can enhance Adella’s Harp if you speak to Grais and Lumen.
Step 1. Talk to GraisA Reian Sorcerer in Accord Square at Rancora Fortress..
Step 2. Find LumenA Reian High Sorcerer in Kamar. He does not suffer fools gladly. in Kamar and convince him to help you.
Step 3. Collect the Materials to Strengthen the HarpMaterials needed to strengthen Adella’s Harp. You need Upsorceller, Magical Aether Crystal, and Fusion Fragment along with Adella’s Harp. and bring them to UlianA Reian Sorcerer in the Rancora Fortress. He does not want to go outside.. (You need to collect: Adella’s Harp)
Siel’s Wealthy Harp