Diablo 4’s next season, Season of Hell’s Legacy, will go live on 15th September to celebrate the franchise’s 30th anniversary and Nintendo Switch 2 debut.

At BlizzCon’s opening ceremony, developer Blizzard said the season will be a tribute to three decades of Diablo, built around the return of Deckard Cain and a rematch against all three original Prime Evils: Diablo, Baal, and Mephisto.

Cain’s spirit returns to warn players that echoes of the three Prime Evils have resurfaced. Each one’s holed up in a location familiar to those who’ve played the earlier games – Tristram Cathedral, Arreat Summit, the Durance of Hate. Beat one and you get a Soul Splinter, which lets you borrow a bit of that demon’s power. The catch is that it also makes you more vulnerable to that same demon.

That’s not all, either. Nine new Legacy Uniques also join the game permanently, including a returning Stone of Jordan, alongside a batch of enemy encounters called Waking Nightmares that recreate specific moments from Diablo’s past.

The new content is slated to go live at 5.30pm UK time on 15th September.

Diablo 4 is also making its Nintendo Switch 2 debut that day. The Age of Hatred Collection brings the base game with the Vessel of Hatred and Lord of Hatred expansions, supporting cross-play and cross-progression with other versions.

The Amazon’s back too, marking her first appearance in Diablo 4. She’s due sometime in the first half of 2027, with a bow and javelin in hand and four builds: Champion, Skirmisher, Ranger, Commander.

It’s one of several big reveals from BlizzCon 2026’s opening ceremony, which also included Diablo 5, World of Warcraft: Forever, and a new open-world StarCraft shooter. For more, here’s everything announced in the BlizzCon 2026 Opening Ceremony.