Diablo 4 Season Of Blood
In Diablo 4 Season 2, Season of Blood, Sanctuary is beset by a newly turned army of ravenous vampires, and it is up to you to "hunt the hunter." There are not a ton of details yet, but both the announcement trailer from Gamescom's Opening Night and the associated news post mention wielding Vampiric Powers against their originators.
Blizzard surprised us by announcing Diablo 4 Season 2 during Gamescom Opening Night, with over a month of Season 1 still to come.
At Gamescom 2023, Blizzard announced Season 2 for Diablo 4, Season of Blood, is arriving October 17.