Diablo 4 Season 15 Guide With Start Date and Everything New

Neviriah

Senior Editor

Published Sep 12, 2026Updated Oct 18, 2026

Diablo 4 Season 15, Season of Hell's Legacy, is currently live! This page is an in-depth source of information, keeping everything you need in one place. You will find the start date, the full feature set, the latest patch updates, as well as class and build recommendations.

Blizzard revealed this season at BlizzCon 2026 and also published an official blog post with it. Below, we will include all the information, such as the seasonal theme, its new questline, and the reward track.

Verified for Patch 3.2.2

Diablo 4 Season 15 in 60 Seconds

The quick version is that the seasonal questline sends you after the three Prime Evils (including Diablo!), and the Splinter of Evil (Splinter of Destruction, Splinter of Hatred, Splinter of Terror) you choose will affect your endgame. Soul Splinters bring strong jewelry powers with drawbacks, Legacy Uniques add familiar items into Diablo 4 for good, and Rebirth lets you carry an Eternal character’s identity into a new season. Waking Nightmares, Mythic crafting changes, new Charms, and the Horadric Post are all new features coming with Season 15.

Jump to What You Need

• Season 15 start date

• The Prime Evil questline

• Soul Splinters

• Legacy Uniques

• Diablo 2 Runewords

• Mythic crafting and Charms

• Rebirth

• Waking Nightmares

• Class and build recommendations

• Launch preparation

• Season Rewards

• Seasonal and permanent features

• Latest news

• Season 15 FAQ

When Diablo 4 Season 15 Starts

Diablo 4 Season 15 launched on Tuesday, September 15, 2026. There was only a short gap between the end of BlizzCon and the actual start of the new season. Season 14 ended when Season 15 began, with characters and eligible items moving to the Eternal realm as usual.

Your Season 14 War Plans reputation also carried over to Eternal on September 15 and adds to any matching Eternal character's progress. For Hardcore, only living characters transferred their points.

How the Prime Evil Questline Works

The Season of Hell's Legacy is themed around Diablo's 30th anniversary and a fight for the very soul of Sanctuary. The legendary Horadrim Deckard Cain has returned with a warning about three dark wanderers who have come back, each dragging a Prime Evil behind them. The seasonal questline sends you into their nightmares to defeat echoes of Diablo beneath Tristram Cathedral, Baal at the Arreat Summit, and Mephisto (once again) in the Durance of Hate, where you have to survive and claim a Splinter of Evil from each.

You can only bear one Prime Evil Splinter at a time, which turns you into a dark wanderer yourself. While you carry the Splinter, you will gain an Iconic Power that is linked to the Evil it inhibits and will erupt during combat: Fire for Diablo, Cold for Baal, and Physical for Mephisto. However, with great power comes great responsibility, and so, of course, there is a trade-off, which is that the respective Prime Evils hunt you back, so you take more of the related damage in return.

Each Splinter has its own reputation track, with eight activity modifiers and six upgrades to its Iconic Power, unlocked through War Plans. The one you carry affects different parts of Diablo 4's endgame:

• Diablo's Splinter of Terror changes Helltide and Infernal Hordes

• Baal's Splinter of Destruction changes the Undercity and Lair Bosses

• Mephisto's Splinter of Hatred changes the Pit and Nightmare Dungeons

• All three change the Tree of Whispers

To switch paths, you have to pick up a different Splinter from the largest Waking Nightmares.

The Splinters of Evil are questline rewards and are separate from the socketable Soul Splinter gems of Season 15, even though the names are similar!

How Soul Splinters Work

Soul Splinters are very different from the Splinters of Evil. They are socketable items for rings and amulets, and each one gives you Physical or Elemental Resistance, as well as a powerful effect. 

However, there is always a catch, because every Soul Splinter also comes with a drawback. This means that choosing one is more than simply adding free damage to your character. You need a build that can even out the cost, so that the drawback of a Soul Splinter does not overpower the benefit you would get from it for your chosen build.

Soul Splinters drop in Magic, Rare, Legendary, and Unique quality, and you can equip up to three at once across your jewelry slots. To upgrade one, use the Amalgamation recipe in the Horadric Cube, which combines Splinters of the same type and rarity into the next rarity up.

The right choice depends on what your setup can give up. For example, the Splinter of Hellfire looks powerful for a setup that does not need Critical Strike Chance, but it is a bad fit for anything built around critical hits. The Splinter of Pain is much safer for players trying to grind through difficult content, although losing Movement Speed will feel much worse during farming.

The Legacy Uniques Coming to Diablo 4

Season 15 added a few familiar uniques from Diablo, Diablo 2, and Diablo 3 into Diablo 4. These are permanent additions to the game, which means it is not simply loot that disappears when the season ends.

Most of the names and old identities stay as is, but the Diablo 4 versions are changed to fit the current item system. Leoric's Crown, for example, counts as Jewelry and increases the effect of a non-Legendary gem socketed into it. Seven of the nine also come as Unique Charms, everything except Leoric's Crown and Messerschmidt's Reaver.

Nine legacy Uniques, four available to all classes and five limited to specific classes, all permanent additions on both the Seasonal and Eternal realms.

Diablo 2 Runewords

After the release of Season 15, players quickly figured out that the game team had added Diablo 2 runewords to the game. Another throwback to a legacy system.

In Diablo 4, however, you can drop a white item plus the required Runes into the Horadric Cube, and what comes out is a Unique based on a famous Diablo 2 Runeword.

There are a handful of the classic recipes: Stealth, Enigma, Grief, Spirit, Call to Arms, Infinity, Insight, Phoenix, Leaf, Lore, King's Grace, Ancient's Pledge, Holy Thunder, Prudence, Rain, Strength, Pattern, Edge, and Zephyr.

Find out more in our news below:

Diablo 4 secretly brought back some of Diablo 2's best RunewordsNewsSep 16, 2026

Mythic Crafting and Charms Are Changing

In Season 15, the Horadric Cube has a new Upgrade to Mythic recipe. It turns a Unique into its Mythic version while keeping the item’s affixes, Tempering, and Masterworking. That gives a good Unique base far more value than it has now.

There are restrictions, though. The recipe costs more than other Mythic crafting options; it cannot be used on an Unmodifiable item, and the result receives a Crafted tag. You can only equip one item with that tag. Mythics created through the Jeweler or obtained from the Blacksmith’s Mythic Cache do not receive this tag.

So in short, there are three ways to make a Mythic Unique, the Horadric Cube Upgrade Direct recipe, the Jeweler's Rune Crafting, and the Blacksmith's Mythic Cache, and only the Horadric Cube route applies the Crafted tag.

Two new Horadric Cube recipes also arrive with the Season of Hell's Legacy:

• Affix Value Reroll rerolls all base affixes on gear and Talismans while protecting Greater Affixes, Enchanted affixes, Tempers, and Transfigurations.

• Horadric Reroll works on Legendary and higher Charms and Seals, fully randomizing their base affixes without affecting Set Bonuses or Unique and Mythic charm powers.

Iconic Mythics (such as Harlequin Crest) stay Mythic-quality only. Season 15 also added a second Blacksmith cache that rolls only Iconic Mythics, at the same cost as the Mythic Uniques cache.

Charms are changed, too. Any Unique Charm can also have a low chance to drop at Mythic quality. There is no crafting recipe or specific target-farming method for Mythic Charms.

How Rebirth Works in Season 15

Rebirth lets you move an Eternal character into the Seasonal Realm and reset that character to Level 1. It saves the character's identity and history, but it does not carry seasonal power or progression forward.

Rebirth Keeps

• Class

• Name and appearance

• Normal or Hardcore state

• Cosmetic preferences (transmogs, pigments, mounts, pets, portals, and headstones, when the character is saved as part of an ensemble)

• Total playtime across Rebirths

Rebirth Resets or Removes

• Character level

• Skills and Paragon progression

• Equipped gear

• Personal inventory

• Seasonal progress

Your character must have no equipped items and nothing in its personal inventory before you can use the Rebirth feature on it! Move anything important into your Eternal stash first. The game will warn you before items are removed and gives you the option to move them or destroy them, but this is still a step worth handling carefully beforehand.

Rebirth is mostly about continuity. You keep the same character, appearance, cosmetics, and playtime history, but you still begin the season at Level 1 like everyone else.

Waking Nightmares

Waking Nightmares are the new seasonal activity, and each one is meant to bring back a memory from Diablo’s past, rebuilt for Diablo 4 with updated visuals and encounters. They come in three different sizes.

The largest Waking Nightmares are multi-level dungeons similar to Capstones, where you face the Prime Evils in some of Diablo’s most iconic battles. You will first encounter them during the seasonal questline before unlocking them as repeatable activities on Torment difficulty. Like other Capstone Dungeons in Diablo 4, these have a fixed difficulty. They also return as pinnacle Capstones at Torment 10 and above, with stronger enemies but better rewards.

The second type is closer to a regular dungeon. These are meant to recreate familiar places or moments such as the Den of Evil from Diablo 2, and appear at fixed locations across Sanctuary.

The smallest Waking Nightmares can suddenly appear in the open world. These are short, one-room encounters featuring either a returning boss like Queen Araneae (from Diablo 3) or waves of classic enemies, including the dagger-wielding Flayers.

The Horadric Post Brings Rewards to Your Account

The Horadric Post is a one-way delivery system for account messages and rewards. Blizzard can use it to send supplies, commemorative items, and other deliveries straight to your account.

Think of it as a new account mailbox rather than a seasonal activity.

Our Early Class and Build Recommendations

Barbarian took a clear nerf in the 3.2.1 launch patch notes, with its core stat scaling cut and a round of aspect and glyph reductions, after being strong for the past few seasons. Most other classes went the other way. For example, Druid, Necromancer, Paladin, and Sorcerer all had their core stat scaling increased, and Paladin and Necromancer specifically pulled up from behind. Warlock remains strong, but a few of its top aspects were adjusted.

Your best choice is still a class you enjoy enough to play after the first balance update. Pick one main and one backup, then read the latest patch notes before you lock in your choice!

Our Season 15 starting class breakdown explains the early recommendations in more detail.

Remember that Paladin and Warlock require Lord of Hatred. Spiritborn requires Vessel of Hatred.

What to Do Before Season 15

You do not need a huge preparation checklist, but there are a few small steps that can make your first day of the season a little bit easier.

• Choose your first class and one backup in case you change your mind.

• Pick an Eternal character for Rebirth if you want to keep its name, appearance, cosmetics, and playtime. 

• Move every equipped and carried item off that character before using Rebirth.

• Remember that your Season 14 War Plans reputation carried to Eternal - and for Hardcore, only living characters keep it.

Once you start Season 15, follow the Prime Evil questline far enough to claim your first Splinter of Evil before you focus on your usual leveling route.

Season Journey and Rewards

The Season of Hell's Legacy has nine ranks and a total of 125 objectives, with a larger track than last season. Working through it earns you account-wide progression and cosmetics, including:

• Up to 14 Skill Points and up to 42 Paragon points

• Up to 10 Resplendent Spark, and more from Mythic Caches

• 5 Mythic Unique Caches

• The Dark Wanderbear pet and the Banner of the Three mount trophy

• 2 Emblems, 2 Titles, and 4 Title Laurels

• Crafting and Masterworking materials, currency, Lair Boss Keys, and reward caches

Around 15% of the Seasonal Objectives require the Lord of Hatred expansion, including the objectives needed to finish Rank VIII and to earn every Season Rank reward.

Season Blessings return as well! You earn Smoldering Ashes from objectives and chapter rewards, then spend them on five Urns that improve your drops for Curiosities, Reclamation, Masterworking, Glyphs, and Ancestral Whispers.

In terms of cosmetic items, the free Battle Pass Reliquary comes with the Eidolon Mount, its Eidolon's Barding armor, and the Ancient Town Portal. But that is not all, because for the first time, the Armor Reliquary also includes armor sets that are specifically tailored to each class. The Deluxe Battle Pass bundle costs 2,800 Platinum and adds the Archangel of Justice set, the Lordling of Terror pet, and Wings of Justice.

What Stays After Season 15

Soul Splinters (the gems) are seasonal, confirmed in-game as Seasonal Items. Legacy Uniques are permanent additions available across Diablo 4. Rebirth, the Mythic crafting changes, the new Charms, and the Horadric Post are base features, so they stay after the season on both realms.

Season 15 Secrets and Quick Guides

Season of Hell's Legacy has a lot of hidden zones and secret bosses that the patch notes never mentioned. We are collecting every one we have covered here, so you can work through the list without hunting for each news article. For the running checklist of everything players have found so far, see Diablo 4 Season 15 has so many secrets, players are losing track.

Secret Zones and Hidden Bosses

• How to unlock the Echo of Tristram. Collect three Splinters, find Deckard’s journals, and open the Pandemonium Event.

• When you are ready for Uber Tristram. If Pit 120 feels comfortable, you can take on all three Prime Evils at the same time.

• Do not click the Uber Tristram exit portal by mistake. It spawns right next to the entrance.

• The Lucky Coin quest and the Uber Horadrim. Three hidden coins unlock a fight against the echoes of Neyrelle, Lorath, and Donan. And Hardcore has its own special title for beating the Echoes of the Horadrim

• How to get the Hellfire Torch. An additional Unique Charm slot and some strong affixes.

• How to find Whimsyshire and its rainbows, angry Cuddle Bears, and a unicorn called Neigh’Relle. Drink your Liquid Rainbow. It does not stack, so holding one blocks the next drop. Also, do not ignore a Whimsyshire portal, as it will vanish if you finish another activity first.

• The secret Temple of Baal and its sheep

• Pindleskin is back in Nightmare Dungeons

• Annihilus and Uber Diablo. The trigger is still unsolved. Consider how long to wait after a World Boss for Uber Diablo

The Secret Cow Level

The Secret Cow Level is back in Season 15, but getting to this secret level takes some commitment. You start by killing 666 cows in three specific regions to earn three relics, which you cleanse at the fountain in Ked Bardu to get the Strange Key for the Forlorn Hovel. From there, a chain of Horadric Cube recipes eventually unlocks a boat ride from Cetos, but only on a Tuesday. The Bell of the Bovine makes the cow grind much faster by summoning exploding cows that count toward each relic, and Squirt the Peddler now sells a pouch that lets you skip most of the questline in future seasons.

If you only want to fight Moophisto, there is a much quicker route. A hidden Butcher side quest in Old Tristram gives you the five Prime Rib needed to summon him at the Altar of the Heifer in Skovos, no cow farming required. He can drop the Bell, the Marquis Milky pet, and pieces of the secret cow armor set. And when you leave the Cow Level, take the right exit, because it leads to a hidden island with a Mythic Fish you can only catch there.

Latest Diablo 4 Season 15 News

This guide page covers all currently known Season 15 answers. Our news coverage, however, follows individual announcements, balance updates, reactions, and anything that changes quickly. 

• Diablo 4 Expert and Penitent Difficulty Changes

• Diablo 4 Season 15 Makes War Plans Account-Wide

• Diablo at BlizzCon 2026

• Diablo 4 Season 15 trailer brings old nightmares back

• Diablo 4 Season 15 was hiding Deckard Cain from the PTR

• Diablo 4 Soul Splinters offer choice, but the best picks already look obvious

• Diablo 4 Season 15 final patch notes are here

• Diablo 4 now has a no-button Sorcerer build pushing past Pit 120

• Diablo 4 players have a plan to keep Legacy Dungeons after Season 15

• You have about eight weeks left in Diablo 4 Season 15, so here is when it ends

• Diablo 4’s one-button Rogue build is now strong enough for Pit 130

• Diablo 4 may not be done with the Hellfire Torch after Season 15

We will keep this list focused on the newest useful coverage rather than turning it into a complete archive.

Diablo 4 Season 15 FAQ

We will keep this page current through the season. The visible update time and changelog will only change when we add or correct something meaningful.

Official sources

• Celebrate 30 Years of Diablo in Season of Hell's Legacy (official blog)

• Diablo 4 3.2.1 official patch notes

• BlizzCon 2026 schedule

• Official Diablo 4 website