Akarat is the overarching protagonist in Diablo IV: Vessel of Hatred.
He directs The Wanderer to find another spirit, Ah Bulan to help Neyrelle. After Neyrelle regain control over herself, Akarat orders her to find his tomb, where they can keep Mephisto for good. However, Eru in the tomb reveals his true nature and betrays the Wanderer and Neyrelle by making a deal with Mephisto to save Nahantu. This forces Akarat to sacrifice his immortal soul to help The Wanderer kill the Harbinger of Hatred.