Diablo IV Season 15: Hell's Legacy Start Time and Mechanics

The current season is season 15, Season of Hell’s Legacy, live since 15 September 2026 on patch 3.2.1. It is also Diablo’s 30th anniversary season.

Blizzard has not announced an end date. Any page stating one is guessing.

The two seasons on the timeline

Season 14 ended at the changeover on 15 September 2026 and its characters moved to Eternal. Solo Self Found, the Tower and Leaderboards were its headline changes; the recap is on the season 14 page.

What season 15 adds

• Soul Splinters. Gems tied to a demon or artefact, up to three socketed into jewellery. Strong bonuses with downsides attached, and the season’s central trade-off.
  • There are eight: Anguish (Andariel), Sin (Azmodan), Lies (Belial), the Black Soulstone, Pain (Duriel), the Mother (Lilith), Hellfire (Na-Krul) and Damnation (Skarn).
  • Each drops at Magic, Rare, Legendary or Unique quality. Same type and same quality combine in the Horadric Cube to upgrade a tier.
• Waking Nightmares. Three shapes.
  • The largest are multi-level, fixed-difficulty capstone dungeons. You meet them in the seasonal questline first, then replay them at any Torment, including as pinnacle capstones from Torment 10.
  • The second type is a fixed-location, standard-length dungeon.
  • The third appears suddenly in the open world as a single room.
• Rebirth. Lets an existing hero start a fresh seasonal journey without creating a new character.
• The Horadric Post. A new reward structure that runs alongside the season objectives.
• Nine returning uniques. Messerschmidt’s Reaver, Stone of Jordan and Henri’s Perquisition among them. These are permanent additions available on both Seasonal and Eternal realms.
• Two new Horadric Cube recipes. For reshaping unwanted affixes while protecting the ones you want. One converts an item directly to Mythic quality and keeps every affix and upgrade.
• A larger season journey. Nine ranks and 125 objectives, rewarding up to 14 skill points, 42 Paragon points, 10 Resplendent Sparks, five Mythic Unique caches and the Dark Wanderbear pet.
• The Reliquary battle pass. The free track gives the Eidolon mount, its barding and the Ancient town portal. The premium track adds a full armour set per class for the first time.

One thing new players miss: roughly 15% of the seasonal objectives require the Lord of Hatred expansion, including objectives needed for rank VIII rewards.

The seasonal questline follows three dark wanderers who returned from Pandemonium, each a former vessel of a Prime Evil, guided by the soul of Deckard Cain. Blizzard describes it as the legacy of Sanctuary’s darkest legends.

The season also hides content the patch notes never mention, including the Old Tristram boss and the Whimsyshire portal. That list is on the season 15 secrets page.

What carries over

• War Plans reputation: shared across characters in the same partition since season 15, and points earned on season 14 characters carried into Eternal at the changeover.
• Hardcore characters: only characters still alive at the end of a season can transfer War Plans points out. A dead Hardcore character needs another living character to walk through the changeover.
• Seasonal characters themselves: they move to Eternal when the season ends rather than disappearing.

What happened after launch

Launch did not go smoothly. First came five and a half hours of failed logins. Then, on 16 September 2026, Solo Self-Found was disabled because old seasonal progress had not reset properly. Tree of Whispers caches and SSF were only fixed on 18 September 2026 with HOTFIX 3.

The full sequence is on the launch post-mortem. If you still cannot log in, use the code 34202 fix order.

What to do now

1. If you want a fresh start, use Rebirth to bring an old character into the season, or roll a seasonal character.
2. Push the campaign and the seasonal questline first. Adjust the build once Soul Splinters are in hand.
3. On an account with several characters, keep an eye on War Plans sharing and the carry-over.

Sources

• Official season page: source
• Blizzard, “Celebrate 30 Years of Diablo in Season of Hell’s Legacy”: source
• Polygon on the season start time and delay: source