Once someone gains the power of titans, they get implicated by the “Curse of Ymir,” living for only 13 years more. Therefore, most titan shifters like Eren, Frieda, and Grisha died young.
To start the fight, you must first complete most of Ymir’s side quest and defeat Metyr, Mother of Fingers. Once this boss is defeated, Count Ymir will reclaim the title of Mother of Fingers. There is ...