Diablo IV Season 15: Season of Hell's Legacy is estimated to end around December 2, 2026, based on its 78-day season cadence (verified October 14, 2026). Season 15: Season of Hell's Legacy went live on September 15, 2026 at 17:00 UTC, opening Diablo's 30th-anniversary season. For the first time all three Prime Evils, Diablo, Mephisto and Baal, appear together in one season, alongside the return of Deckard Cain and a living-history questline that recreates moments from past Diablo games.
When Does Diablo 4 Season 15 End?
Diablo 4 Season 15: Season of Hell's Legacy is live now; it launched on September 15, 2026 at 17:00 UTC. Blizzard has not yet confirmed the Season 15 end date, so the countdown above tracks the current best estimate and updates the moment an official timestamp is announced.
Diablo IV seasons have averaged roughly 80 days across recent regular seasons, ranging from about 63 to 105 days. Applying that cadence to a September 15 start puts the expected wind-down for Season of Hell's Legacy in late November or early December 2026. Treat that as a planning window, not a hard deadline, Blizzard usually confirms the exact end date once the following season's PTR begins.
What's New in Season of Hell's Legacy
Season of Hell's Legacy launched on September 15, 2026 with patch 3.2.1 and marks the series' 30th anniversary. Its questline draws in echoes of all three Prime Evils, Diablo, Mephisto and Baal, with Deckard Cain back to guide it.
Prime Evil Splinters and Waking Nightmares
Defeating a Prime Evil grants a Splinter: Terror from Diablo, Destruction from Baal or Hatred from Mephisto. Only one can be carried at a time, and each grants a strong passive that comes with a price attached. Waking Nightmares are the season's dungeons, rebuilt locations filled with bosses and enemies from Diablo, Diablo II, Diablo III and Diablo Immortal. Reputation earned in them unlocks six upgrades for each Splinter.
Rebirth and crafting changes
Rebirth converts an Eternal Realm character into a Seasonal one. The hero restarts at level 1 but keeps its class, name, appearance and Hardcore or Normal status. Alongside it, Mythic Unique crafting becomes more deterministic, Mythic Charms can drop in place of Unique Charms, the Horadric Cube gains two reroll recipes, War Plan reputation is shared across the account, and the Horadric Post delivers rewards straight to the account. Nine Legacy Uniques also return.
Battle Pass and The Witcher crossover
Seasonal cosmetics run through the Reliquary. The free Battle Pass Reliquary includes the Eidolon mount, its barding and the Ancient Town Portal, and the premium pass costs $9.99 (1,000 Platinum). For the first time, the Armor Reliquary offers armor sets designed for each class. Separately, a Geralt-inspired Barbarian skin from the Diablo IV x The Witcher 3 collaboration comes with The Witcher 3's Songs of the Past expansion when it is bought on Battle.net; it is confirmed for PC only so far.
Before Season of Hell's Legacy Ends: What to Finish
When the season closes, seasonal characters move to the Eternal Realm with their gear intact, but the seasonal systems close behind them.
Reliquary and Battle Pass
Reliquary and Battle Pass rewards that have been unlocked but not claimed cannot be reached once the season ends. That covers both the free track with the Eidolon mount and the premium pass, so it is worth opening the Reliquary and claiming everything before the final day.
Season Journey
The Journey has nine ranks and more than 125 account-wide objectives. Its payouts are some of the most useful in the season:
- up to 14 Skill Points and 42 Paragon points
- up to 10 Resplendent Sparks, the material Mythic Unique crafting depends on
- five Mythic Unique Caches
- the Dark Wanderbear pet and the Banner of the Three mount trophy
Splinters and Waking Nightmares
Prime Evil Splinters and Waking Nightmares are Season of Hell's Legacy mechanics. Farming the remaining Splinter upgrades, and the Sparks and Mythics that come with high-level play, makes most sense while the season is live and the seasonal ladder still counts.
What Comes Next After Season of Hell's Legacy
Season 16 has no name or date yet. At BlizzCon 2026 the Diablo IV team confirmed that seasons will continue after Season of Hell's Legacy, but nothing about the next theme has been announced. Blizzard normally previews a new season in a developer update livestream shortly before launch, sometimes after a Public Test Realm, and the current season's exact end time is usually confirmed around then. Earlier seasons are listed in every Diablo 4 season.