Diablo IV

Diablo IV is turning 30 years of Diablo history into playable content with Season of Hell's Legacy, a major anniversary season built around the return of legendary villains, locations, items, and characters from across the franchise.

Launching on September 15, 2026, Season of Hell's Legacy puts Diablo, Baal, and Mephisto back at the center of the action. Deckard Cain returns, classic locations such as Tristram Cathedral and the Durance of Hate reappear through new encounters, and players can harness fragments of the Prime Evils themselves.

The season is not simply a nostalgia event. New systems such as Splinters of Evil, Waking Nightmares, Soul Splinters, Rebirth, Legacy Uniques, shared War Plans, and updated Mythic crafting give players several new progression paths while connecting Diablo IV directly with three decades of franchise history.

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Diablo IV Season of Hell's Legacy at a Glance

Diablo, Baal, and Mephisto Return

The biggest attraction of Season of Hell's Legacy is immediately clear: all three Prime Evils are back at the heart of the seasonal experience.

The story begins as souls emerge from Pandemonium, including the lost soul of Deckard Cain. Cain warns the player about three dark wanderers who are being tormented by the Prime Evils.

Players must enter their nightmares and confront echoes of three of Diablo's most famous villains:

• Diablo beneath Tristram Cathedral

• Baal at Arreat Summit

• Mephisto within the Durance of Hate

These locations are more than recognizable names. Each connects the season with important moments from earlier Diablo games, reinforcing Blizzard's goal of turning the franchise's 30th anniversary into something players can actually experience.

Defeating the three Prime Evils during the seasonal questline rewards their Splinters of Evil, which unlock one of Season 15's central progression systems.

Splinters of Evil Let You Become a New Dark Wanderer

After obtaining the Splinters, players can choose to bear the power of one Prime Evil and effectively become a new dark wanderer.

Each choice grants a different Iconic Power.

All three can also influence the Tree of Whispers.

These powers periodically activate during combat, but they are deliberately designed around risk and reward. Carrying the power of a Prime Evil also increases your vulnerability to that same Evil.

Choosing a Splinter additionally opens its associated Reputation Track, with each track containing:

• 8 Activity Modifiers

• 6 Iconic Power upgrades

• Prime Evil-specific progression

• Modified versions of existing endgame activities

Only one Prime Evil Splinter can be active at a time.

However, players are not permanently locked into their first choice. Completing major Waking Nightmares can provide opportunities to obtain another Splinter and switch allegiance, allowing different endgame activities and powers to be explored during the season.

Waking Nightmares Recreate 30 Years of Diablo History

If Splinters of Evil are the main progression mechanic, Waking Nightmares are the centerpiece of the anniversary celebration.

These encounters recreate memorable moments, monsters, bosses, and locations from older Diablo titles while adapting them to Diablo IV's modern combat and dungeon systems.

Rather than reproducing one older game, Blizzard is drawing material from across the franchise, including:

• Diablo

• Diablo: Hellfire

• Diablo II

• Diablo III

• Diablo Immortal

Waking Nightmares appear in several forms, ranging from quick open-world encounters to challenging multi-level dungeons.

Large Waking Nightmares

The largest versions function as multi-level Capstone-style dungeons built around major confrontations with the Prime Evils.

Players encounter them as part of the seasonal storyline before gaining access to replayable Torment versions.

At Torment 10 and above, more difficult Pinnacle Capstone versions become available, providing a harder challenge and improved rewards for endgame characters.

Dungeon-Sized Waking Nightmares

Other Waking Nightmares resemble traditional Diablo IV dungeons and appear at fixed locations.

One of the confirmed examples is the Den of Evil, the famous early dungeon from Diablo II.

The idea is not simply to copy the original dungeon. Instead, Blizzard is recreating these memories as Diablo IV encounters while retaining the characters, themes, and locations that made them recognizable.

Open-World Waking Nightmares

Smaller versions can appear while exploring Sanctuary.

These are faster encounters centered on returning enemies or bosses and are designed to make classic Diablo memories appear naturally during regular open-world play.

Confirmed returning enemies include recognizable threats such as Queen Araneae, Flayers, and Nihlathak, while familiar characters including Leah are also represented through the anniversary content.

With nearly 20 returning bosses referenced by the developers, Waking Nightmares provide Season 15 with a much broader historical scope than a conventional seasonal activity.

Soul Splinters Add Risk and Reward to Builds

Season of Hell's Legacy adds another progression layer through Soul Splinters.

Unlike the three main Prime Evil Splinters, Soul Splinters are seasonal socketable items that can be placed in jewelry. Players can equip up to three simultaneously, creating additional opportunities for build customization.

Soul Splinters are associated with notable Diablo villains and artifacts, including:

• Andariel

• Azmodan

• Belial

• Duriel

• Lilith

• Na-Krul

• Skarn

• The Black Soulstone

Like the Prime Evil system, these items generally follow the season's risk-versus-reward philosophy by pairing useful powers with drawbacks.

They are available across multiple rarity tiers and can also interact with the Horadric Cube, giving players another reason to experiment with different combinations as their characters progress.

Nine Classic Legacy Uniques Become Permanent Diablo IV Items

The anniversary theme also extends into itemization.

Season of Hell's Legacy introduces nine Legacy Uniques, several of which come from some of the most recognizable equipment in Diablo history.

For longtime players, names such as Stone of Jordan, Leoric's Crown, In-Geom, The Furnace, and Messerschmidt's Reaver immediately connect Season 15 to earlier eras of the franchise.

More importantly, these are not temporary seasonal rewards.

Blizzard has confirmed that the nine Legacy Uniques are permanent additions to Diablo IV, making them available beyond Season of Hell's Legacy in both Seasonal and Eternal play.

Several of them can also appear as Unique Charms, providing additional build possibilities.

Rebirth Makes Starting a New Season Easier

Season 15 also introduces Rebirth, one of the more practical quality-of-life additions for longtime players.

Instead of abandoning a favorite Eternal character and creating a completely separate seasonal hero, players can rebirth that character into the new season.

The character returns to Level 1, allowing seasonal progression to begin normally while preserving parts of the character's identity.

Rebirth can retain elements such as:

• Character name

• Class

• Appearance

• Normal or Hardcore status

• Eligible cosmetic preferences

• Historical playtime

Equipment does not transfer into the season through this process, so players need to move existing items into their Eternal Stash before completing Rebirth.

For players who have maintained the same characters across multiple years of Diablo IV, the feature provides a more continuous way to participate in new seasons.

War Plans Progression Is Now Shared

Players who prefer maintaining several characters receive another important improvement.

War Plans progression can now be shared between eligible characters on the same account.

Characters must belong to matching progression categories involving:

• Seasonal or Eternal

• Hardcore or Non-Hardcore

• Normal or Solo-Self Found

Progression is shared within the appropriate group, but individual characters still maintain their own War Plans layouts.

That distinction is important because it allows an account to benefit from shared progression without forcing every character to use the same setup. A Barbarian and Sorcerer, for example, can spend their available points differently according to their individual builds.

The result should significantly reduce repeated progression for players who regularly create alts.

Mythic Unique Crafting Gets More Flexible

Season of Hell's Legacy also changes how players interact with some of Diablo IV's rarest equipment.

Mythic Unique crafting involves several crafting locations, including the:

• Horadric Cube

• Jeweler

• Blacksmith

One particularly notable option allows eligible Unique equipment to be upgraded directly into Mythic status through the Horadric Cube.

This system is designed to preserve much of the investment already made into a valuable item, including relevant item customization and progression.

There is an important restriction.

Mythics created through this method receive a Crafted Tag, and players can equip only one Crafted-tagged item at a time.

That keeps direct Mythic upgrading valuable without completely replacing traditional endgame item hunting.

Season 15 Includes 9 Ranks and 125 Objectives

Players looking for long-term seasonal progression will have nine Season Ranks and 125 Objectives to complete.

The progression track includes rewards such as:

• Up to 14 Skill Points

• Up to 42 Paragon Points

• Up to 10 Resplendent Sparks

• 5 Mythic Unique Caches

• Dark Wanderbear Pet

• Banner of the Three Mount Trophy

• Lair Boss Keys

• Runes and Sigils

• Crafting and Masterworking materials

• Currency and equipment caches

• Titles, Emblems, and Laurels

There is one important requirement for completion-focused players.

Blizzard states that approximately 15% of the seasonal objectives require the Lord of Hatred expansion, including objectives connected to completing some of the later Season Rank progression.

Why Season of Hell's Legacy Stands Out

Season of Hell's Legacy is much more than a collection of anniversary cosmetics.

Blizzard is using Diablo's 30th anniversary to connect the history of the franchise directly with Diablo IV's current gameplay.

The return of Diablo, Baal, and Mephisto provides the headline attraction, but the broader combination of Waking Nightmares, Splinters of Evil, Soul Splinters, Legacy Uniques, and recreated classic locations gives the season its identity.

At the same time, permanent Legacy Uniques, Rebirth, shared War Plans, and Mythic crafting changes give Season 15 additions that remain relevant beyond its nostalgia-focused content.

For veteran players, Waking Nightmares offer an opportunity to revisit enemies and locations associated with decades of Diablo history in a new form. For newer players, the season provides a playable introduction to many of the villains, places, and items that helped shape the franchise.

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With Deckard Cain returning, three Prime Evils waiting to be challenged, classic Diablo memories invading Sanctuary, and players themselves able to carry fragments of Hell's greatest powers, Season of Hell's Legacy turns Diablo's 30th anniversary into a journey through the series' past while continuing to expand Diablo IV's endgame.