Diablo 4's storyline is set in a world still reeling from the devastating events of Reaper of Souls. The game takes place 50 years after Malthael's assault on humanity, with Sanctuary struggling to recover. This backdrop provides a rich narrative foundation for the game, exploring themes of tragedy, resilience, and the ongoing struggle between good and evil.

The return of powerful demons like Belial indicates that the forces of darkness are regrouping, posing a significant threat to the fragile peace in Sanctuary. This setup allows players to engage with the game's lore on a deeper level, exploring the motivations and actions of key characters like Belial and understanding their role in the broader narrative.

The game's storyline is also influenced by the return of Lilith, the Mother of Sanctuary, who seeks to spread her influence across the world. This narrative thread weaves together elements from previous games, creating a cohesive and engaging story that draws players into the world of Diablo 4.

As players navigate the game's world, they will encounter various factions and characters, each with their own agendas and motivations. The inclusion of Belial in Season 8 will likely add another layer to this narrative, providing insights into the workings of the demonic forces and their plans for Sanctuary.