In Diablo IV, what is the name of the second seasonal theme?

In Diablo IV, the second seasonal theme is called Season of Blood.

Season of Blood was Diablo IV’s second season and began in October 2023. Its story introduced vampire-related threats in Sanctuary, with players investigating a blood-driven menace and working with the vampire hunter Erys. The season added seasonal powers, new quest content, and additional endgame features.

It followed Season of the Malignant, the game’s first season, and preceded Season of the Construct. Seasonal names are often confused because Diablo IV uses both a numbered season and a separate thematic title. Season of Blood is therefore distinct from the second expansion or from a permanent campaign chapter.

The season also expanded the game’s endgame with encounters involving Lord Zir, a powerful vampire adversary. Later updates changed some systems, but the season’s title and position in the release sequence remain fixed.