Fasimedes told you that your last task before losing your memory was the search for the Artefact of Memory in Kalamatis. Following his suggestion, you found Pernos in Poeta, who said that it was not always good to get your memory back. He asked you if you still wanted it. After Pernos saw your firm resolve, he said that getting your memory back would require a lot of effort. You need to kill Deatheater Mabolo. After you defeated Deatheater Mabolo and returned, Pernos crafted an enhanced Marble of Protection for you and advised you to go to Kalamatis. You reached Kalamatis through the Rift near the Divine Fortress. There, you battled the Balaur, activated the Artefact of Memory and regained your memory. After you were done and had reported back to Fasimedes, he was pleased that after all of your efforts, you were able to regain your memory.