Diablo 4 Season 15: Season of Hell's Legacy – Start Date, Content and Rewards

Diablo 4 Season 15 has a name: Season of Hell's Legacy. Blizzard announced the anniversary season for the franchise's 30th birthday at BlizzCon on September 12, 2026 and published the official announcement article. The season launches on Tuesday, September 15, 2026 alongside patch 3.2.1. This article sums up every confirmed feature: the seasonal questline against Diablo, Baal and Mephisto, the Waking Nightmares, the Soul Splinters, the nine Legacy Uniques, the endgame changes and the rewards from Season Rank and Battle Pass. Last updated: September 12, 2026.

Key Facts

• Diablo 4 Season 15 is called Season of Hell's Legacy and launches on September 15, 2026 with patch 3.2.1.
• The seasonal mechanic is the Splinters of Evil: you carry the Splinter of Diablo, Baal or Mephisto and gain an Iconic Power of that Prime Evil.
• Waking Nightmares recreate key scenes from Diablo I, II and III in three sizes, from Capstone dungeon to open-world encounter.
• Soul Splinters are eight demonic gems for jewelry sockets, each with a blessing and a burden.
• Nine Legacy Uniques such as Stone of Jordan, Leoric's Crown and Messerschmidt's Reaver join the game permanently.
• War Plan reputation becomes account-shared, Mythic crafting becomes deterministic, and the Horadric Cube gets two new reroll recipes.
• Rebirth brings Eternal characters into the season at level 1, and the Horadric Post delivers rewards straight to your account.
• The Season Rank has nine ranks with over 125 objectives, including up to 14 Skill Points, 42 Paragon points and 10 Resplendent Sparks.

When does Diablo 4 Season 15 start?

Blizzard names September 15, 2026 as the launch date of Season of Hell's Legacy. The official season page names the time: 9:30 a.m. PT, which is 12:30 p.m. ET and 6:30 p.m. CEST, half an hour earlier than previous seasons. The Twitch Drops start at 11 a.m. PT, ninety minutes later.

Diablo 4 Season 15 comes with patch 3.2.1. Blizzard will publish the full patch notes separately once they are finalized, and we will cover them in a dedicated article. What happens before then is explained in our article on the end of Season 14.

Seasonal mechanic: the Splinters of Evil

The dead rise from Pandemonium, and the lost soul of the Horadrim Deckard Cain returns with dire news. Three dark wanderers have returned, each leaving a trail of death. In the seasonal questline you enter their nightmares and defeat the echoes of the three Prime Evils:

• Diablo beneath Tristram Cathedral
• Baal at Arreat Summit
• Mephisto within the Durance of Hate

Each victory grants a Splinter of Evil, the centerpiece of Diablo 4 Season 15. You carry only one at a time and become a dark wanderer yourself. In combat, an Iconic Power of that Prime Evil periodically erupts from you: Diablo deals Fire damage, Baal Cold damage and Mephisto Physical damage. The Splinter also makes you more vulnerable to its Prime Evil.

Each Splinter has its own reputation track with eight modifiers and six upgrades for the Iconic Power. You unlock them through War Plans, and each Splinter modifies different activities:

• Diablo's Splinter of Terror modifies Helltide and Infernal Hordes
• Baal's Splinter of Destruction modifies The Undercity and Lair Bosses
• Mephisto's Splinter of Hatred modifies The Pit and Nightmare Dungeons
• All three modify the Tree of Whispers

To switch, return to the largest Waking Nightmares and claim a different Splinter.

Waking Nightmares: Diablo history in three sizes

Waking Nightmares are memories of key events from earlier Diablo games, rebuilt with Diablo 4 visuals and combat. There are three types:

• The largest are multi-level dungeons modeled on Capstone dungeons. They recreate the historic showdowns with the Prime Evils. You meet them first in the questline and can replay them later on Torment tiers. From Torment 10 they appear as the highest Capstone dungeons with more risk and more loot.
• The middle type are standard-length dungeons at fixed locations in the world, such as the Den of Evil from Diablo II.
• The smallest appear suddenly in the open world. Inside waits a one-room encounter, for example with Spider Queen Araneae or waves of dagger-wielding Fallen.

Soul Splinters: eight demonic gems

Soul Splinters are special gems for Diablo 4 Season 15, each tied to a demon or artifact. Every Splinter offers a powerful blessing and carries a burden. You can socket up to three Soul Splinters in your jewelry.

• Splinter of Anguish (Andariel)
• Splinter of Sin (Azmodan)
• Splinter of Lies (Belial)
• Splinter of the Black Soulstone
• Splinter of Pain (Duriel)
• Splinter of the Mother (Lilith)
• Splinter of Hellfire (Na-Krul)
• Splinter of Damnation (Skarn)

Soul Splinters drop as Magic, Rare, Legendary or Unique items. In the Horadric Cube you fuse Splinters of the same type and rarity into the next rarity. All effects and drawbacks are listed in our Soul Splinters guide.

Nine Legacy Uniques from 30 years of Diablo

Diablo 4 Season 15 introduces nine Uniques based on relics from the franchise. They arrive with Season 15 but stay in the game permanently on Seasonal and Eternal Realms. Items marked with an asterisk are also available as Unique Charms for the Talisman.

All classes:

• Leoric's Crown (Helm)
• Nemesis Bracers (Gloves) *
• Stone of Jordan (Ring) *
• Squirt's Blouse (Chest) *

Multiple classes:

• Arioc's Needle (2H Polearm) * – Barbarian, Druid, Spiritborn
• Henri's Perquisition (Offhand Focus) * – Sorcerer, Necromancer, Warlock
• In-Geom (1H Sword) * – Barbarian, Druid, Rogue, Necromancer, Paladin, Sorcerer, Warlock
• The Furnace (2H Mace) * – Barbarian, Druid, Necromancer, Paladin, Warlock
• Messerschmidt's Reaver (2H Axe) – Barbarian, Druid, Necromancer, Paladin, Warlock

The effects and matching builds are covered in our Legacy Uniques guide.

Endgame: shared War Plans

From Diablo 4 Season 15, War Plan reputation is shared between all characters that match in three properties: Eternal or Seasonal, Hardcore or Non-Hardcore and Standard or Solo Self-Found. Every character still keeps its own plans and can distribute the points differently.

The War Plan progress of your Season 14 characters transfers to the Eternal Realm on September 15 and is added up there. For Hardcore, only the progress of living characters counts. From Season 15 on, one living Hardcore character with the same properties is enough, even at level 1. Our War Plans guide explains the system.

Mythic crafting without randomness

Mythic Uniques can still be crafted in three ways: in the Horadric Cube via Upgrade Direct Item to Mythic, at the Jeweler via Rune Crafting and at the Blacksmith via the Mythic Cache. What is new is that the Cube upgrade guarantees a one-to-one transfer. A Tibault's Will with perfect affixes, Tempering and Masterworking becomes the Mythic version with exactly the same values.

The recipe costs more than the other two routes and does not work on non-modifiable items. Transfigured candidates are therefore excluded. Mythics made this way carry a Crafted tag, and you can equip only one Crafted item at a time. Mythics from the Jeweler or the Blacksmith cache do not carry the tag.

Blizzard also reacted to PTR feedback: the Unique versions of Iconic Mythics are gone, and Iconic Mythics stay Mythic-quality only. The Blacksmith's Mythic Cache gets a second option that rolls only Iconic Mythics at the same cost.

Two new Horadric Cube recipes

Affix Value Reroll rerolls the base affixes on gear, Charms and Seals. Greater Affixes, Enchanted affixes, Tempers and Transfigurations are protected, as long as the item is modifiable.

Horadric Reroll applies to Legendary and better Charms and Seals. It grants completely random base affixes without touching Set Bonuses or Unique and Mythic powers. Our Horadric Cube guide explains how every recipe works.

Horadric Post and Rebirth

The Horadric Post is a new mailbox through which Blizzard sends rewards, supplies and commemorative items directly to your account. The system works in one direction only.

Rebirth brings an Eternal character into Diablo 4 Season 15 at level 1. Class, name, appearance and mode are kept. Transmogs, pigments, mounts, pets, portals and headstones saved as part of an ensemble transfer as well. Hours played add up across all Rebirths. You must empty the character completely beforehand, otherwise the items are lost. All details are in our Rebirth guide.

Season Rank, Blessings and Battle Pass

The Season Rank of Diablo 4 Season 15 has nine ranks with over 125 objectives. Roughly 15 percent of the objectives require the Lord of Hatred expansion, including objectives for Rank VIII. The most important rewards:

• Up to 14 Skill Points and up to 42 Paragon points
• Up to 10 Resplendent Sparks plus 5 Mythic Unique Caches
• The Dark Wanderbear pet and the Banner of the Three mount trophy
• 2 Emblems, 2 Titles (Deckard's Confidant) and 4 Title Laurels
• Crafting and Masterworking materials, Lair Boss Keys, Runes, Seals and Talisman Charms

With Smoldering Ashes you unlock five Season Blessings: the Urn of Curiosities (second item from the Purveyor of Curiosities), Urn of Reclamation (rare materials when salvaging), Urn of Masterworking (extra Obducite), Urn of Glyphs (extra glyph upgrade) and Urn of Ancestral Whispers (Ancestral Caches from the Tree of Whispers).

The free Battle Pass Reliquary contains the Eidolon mount, the Eidolon's Barding mount armor and the Ancient Town Portal. For the first time, the armor reliquary holds a dedicated set for every class. The Deluxe Battle Pass costs 2,800 Platinum and unlocks the Archangel of Justice set, the Lordling of Terror pet and the Wings of Justice right away.

Twitch Drop, Game Pass and The Witcher

From September 15, 11 a.m. PT until September 29, 10:59 a.m. PT, Twitch offers the Deforestation two-handed axe. Watch any stream in the Diablo IV category for two hours to earn it. How to link Battle.net and Twitch is explained in our BlizzCon article.

Xbox Game Pass subscribers who link their Battle.net account receive over 50 cosmetics across all classes, including armor sets, mount trophies, a town portal, an emblem and a headstone. Anyone who pre-purchases or buys The Witcher 3 on Battle.net gets a Geralt skin for Diablo 4. Read more in our article on the Witcher crossover.

How to prepare for launch

Three days remain until Tuesday. Our preparation checklist shows what to finish beforehand. For launch day itself, use the leveling guide from 1 to 70, the best leveling builds for all classes and our loot filter codes for Season 15. In the build planner you can set up your Diablo 4 Season 15 build today.

Frequently Asked Questions

When does Diablo 4 Season 15 start?

Diablo 4 Season 15 launches as Season of Hell's Legacy on Tuesday, September 15, 2026 together with patch 3.2.1. According to Blizzard's official season page it goes live at 9:30 a.m. PT, which is 12:30 p.m. ET and 6:30 p.m. CEST.

What is the seasonal mechanic of Season 15?

The Splinters of Evil. You defeat the echoes of Diablo, Baal and Mephisto in the questline and then carry one of their Splinters. It periodically triggers an Iconic Power in combat but makes you more vulnerable to that Prime Evil. Each Splinter has a reputation track with eight modifiers and six upgrades.

What are Soul Splinters?

Eight demonic gems for jewelry sockets, each with a blessing and a burden. You can carry up to three. They drop from Magic to Unique rarity and can be fused into the next rarity in the Horadric Cube.

Do the Legacy Uniques stay in the game after Season 15?

Yes. The nine Legacy Uniques such as Stone of Jordan, Leoric's Crown and Messerschmidt's Reaver are introduced with Season 15 but remain permanently available on Seasonal and Eternal Realms.

What happens to my War Plan progress from Season 14?

It transfers to the Eternal Realm on September 15 and is added to the progress of matching characters there. For Hardcore, only the progress of living characters counts.

Do I need Lord of Hatred for Season 15?

The season is playable without the expansion. However, roughly 15 percent of the seasonal objectives require Lord of Hatred, including objectives needed for Rank VIII and all Season Rank rewards.

Source: Celebrate 30 Years of Diablo in Season of Hell's Legacy, Blizzard Entertainment, September 12, 2026. Images: Blizzard Entertainment.