Warning: This article contains spoilers for Diablo 4. Proceed at your own risk.Although Lilith is the primary antagonist in Diablo 4, her father, Mephisto, is also featured prominently throughout the game's story. With players taking up the quest to prevent Lilith from killing Mephisto and gaining his power, the plot of Diablo 4 hinges on their ability to successfully reach the Cathedral of Hatred in the depths of Hell before Lilith can achieve her goals. However, the game's ending leaves players with a massive cliffhanger as to Mephisto's status, potentially setting him up to play an important role in the first major expansion for Diablo 4.