Diablo 4 Seasonal Guides
Diablo 4 Season 15 Update:
Soul Splinters, Challenge Dungeons, Legacy Uniques & More
Season 15: Name TBD arrives on September 15th (tentatively), bringing one of the biggest updates Diablo 4 has seen since the launch of the Lord of Hatred expansion. Between a brand-new seasonal activity, the complete overhaul of Mythic Uniques, Rebirth, leaderboard rewards, and several quality-of-life improvements, there's a lot to look forward to.
This Season Blizzard is purposefully withholding Seasonal information for a big reveal during the 2026 Blizzcon event so stay tuned for more!
Here's a breakdown of the biggest features coming in Season 15 that we know of.
Soul Splinters
Soul Splinters are a new type of socketable item designed around a risk-versus-reward system. Each Splinter provides a powerful benefit, but many also come with a significant downside that you'll need to account for when putting together your build.
Soul Splinters come in Common, Magic, Rare, Legendary, and Unique qualities and can be upgraded through the Horadric Cube.
They are socketed into Jewelry and also provide Physical or Elemental Resistance depending on the Splinter being used.
The values of each effect scale based on the Soul Splinter's Item Quality.
Splinter of Anguish
Resistance: Fire
Gain 15/20/25/35%[+] Critical Strike Chance and Attack Speed, but your Primary Resource Costs are increased by 30%.
This creates a potentially huge offensive boost for builds capable of handling the increased Resource requirements.
Splinter of Sin
Resistance: Lightning
Gain 10/20/30/40%[x] Maximum Health, but your Maximum Primary Resource is reduced by 30%.
The Maximum Health multiplier could make this an incredibly powerful defensive option, particularly for builds that don't rely heavily on a large Resource pool.
Splinter of Lies
Resistance: Cold
Gain 40/60/80/100% increased Gold Drop Rate and Crafting Material Drop Rate, along with 25% Bonus Experience.
The tradeoff is significant: while equipped, you are always Weakened and Vulnerable.
This could become an interesting farming and leveling option for players willing to sacrifice survivability for additional rewards.
Splinter of the Black Soulstone
Bonus: 7/20/30/50 All Stats
Killing enemies absorbs their souls for 15 seconds. Each absorbed soul increases your damage by 2/3/4/5%[x], but also increases the damage you take by 0.5%.
The effect can stack, but gaining another soul does not refresh the duration.
This has the potential to create some extremely aggressive gameplay, rewarding players who can quickly chain kills together while managing the increased incoming damage.
Splinter of Pain
Resistance: Poison
Gain 10/20/30/40% Damage Reduction, but lose 30% Movement Speed.
It's a straightforward defensive tradeoff: considerably more toughness at the cost of mobility.
Splinter of the Mother
Resistance: Physical
You become Unhindered, and touching enemies makes them Vulnerable for 10 seconds.
However, after touching 100/150/200/250 enemies, you are Stunned for 4 seconds.
This is one of the more unusual Splinters and could have some interesting interactions with highly mobile builds that are constantly moving through enemies.
Splinter of Hellfire
Resistance: All Elements
Deal 40/60/80/100%[x] increased damage, but lose 100% Critical Strike Chance.
This is a massive damage multiplier with an equally massive restriction. Builds that aren't dependent on Critical Strikes could potentially get a tremendous amount of value from this Splinter.
Splinter of Damnation
Resistance: Shadow
Killing an Elite Pack increases Monster Power by 1 for 10/15/20/25 seconds.
This introduces another way for players to intentionally increase the difficulty of the content they're fighting, potentially tying into Season 15's increased focus on optional difficulty scaling.
Challenge Dungeons
Challenge Dungeons are another new mechanic appearing throughout Sanctuary.
During the PTR, these encounters are primarily being used to test the underlying Challenge Dungeon system. The actual encounters available when Season 15 launches will be different from what players experience during testing.
Challenge Dungeon portals can appear throughout the Overland. Entering one will send you into an encounter against a powerful boss.
Once you reach Torment difficulty, things get much more interesting.
Players can choose to increase the difficulty of the Challenge Dungeon by as much as three Torment tiers above their current difficulty.
Increasing the difficulty will also increase the rewards, creating a system where players can decide exactly how far they want to push their builds.
Challenge Dungeons could end up becoming an important part of Season 15's endgame, especially if the final version offers meaningful rewards for taking on higher difficulty levels.
Overland Ambushes
Exploring Sanctuary is also becoming a little more dangerous.
While traveling through the Overland, there is a rare chance that a demon will begin hunting you.
You'll receive a warning when the hunt begins and have 30 seconds to prepare for what is coming.
At that point, you can either attempt to escape or stand your ground and fight.
These encounters are specifically intended to be difficult, giving powerful characters another unexpected challenge while exploring the open world.
It should add an interesting element of unpredictability to areas of Sanctuary that can otherwise become relatively safe once your build reaches the endgame.
Legacy Uniques Return
Several iconic items from Diablo's past are making their way into Diablo 4 as Legacy Uniques.
These items originally appeared throughout Diablo, Diablo II, and Diablo III and should be immediately recognizable to longtime fans of the franchise.
Unlike seasonal mechanics, Legacy Uniques are permanent additions to Diablo 4 and will be available across versions of the game.
Available to All Classes
Leoric's Crown — Helm
Nemesis Bracers — Gloves
Stone of Jordan — Ring
Squirt's Blouse — Chest
Squirt's Blouse is Diablo 4's adaptation of Squirt's Necklace, with the returning item being converted into a Chest piece.
Available to 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, Warlock
The Furnace — 2H Mace
Barbarian, Druid, Necromancer, Paladin, Warlock
Messerschmidt's Reaver — 2H Axe
Barbarian, Druid, Necromancer, Paladin, Warlock
Messerschmidt's Reaver is planned for Season 15 but will not be available for testing during the PTR.
How Legacy Uniques Work
These aren't intended to be an entirely separate tier of equipment. Legacy Uniques function like normal Unique items in terms of overall power and usefulness.
Their Unique effects are inspired by their original versions, although Blizzard has adjusted some of them to work within Diablo 4's current itemization.
Leoric's Crown is a great example.
Its original effect increased the effectiveness of a non-Legendary gem socketed into the Helm by 75–100%.
The Diablo 4 version retains that identity, but the Helm now counts as Jewelry and increases the effect of any gem socketed into it by 75–100%.
That keeps the identity of the original item while allowing it to interact with Diablo 4's current systems.
Major Mythic Changes
Mythic Uniques are receiving another significant overhaul, with a much greater emphasis on giving players control over the Mythic they create.
There will be multiple ways to craft Mythic items, and the method you choose will determine how much control you have over the final result.
Horadric Cube Mythic Crafting
The Horadric Cube will include an Upgrade Direct Item to Mythic recipe.
This is the expensive option, but it also provides the most control.
Instead of generating a random Mythic, the item you place into the Cube is directly converted into its Mythic version.
For example, if you have a perfectly rolled Tibault's Will with the Tempering and Masterworking exactly where you want them, upgrading it through this recipe will retain those affixes and modifications while converting the item into a Mythic.
There is one major restriction:
Unmodifiable items cannot be used with this recipe.
That means you'll want to be extremely careful before Transfiguring an item that you eventually plan to upgrade into a Mythic.
The Crafted Tag
Mythics created through the Horadric Cube's Upgrade Direct Item to Mythic recipe receive a Crafted tag.
You can only equip one item with the Crafted tag at a time.
Importantly, this restriction applies specifically to Mythics created using this Horadric Cube recipe. Mythics obtained through other methods will not automatically receive the Crafted tag.
Jeweler Mythic Crafting
The Jeweler provides another option through Rune Crafting.
Using Resplendent Sparks and Runes, you'll be able to select an item slot such as a Ring or 1-Handed Weapon.
The resulting item will then be a random class-specific Mythic Unique from that slot.
Mythics created through the Jeweler do not receive the Crafted tag, allowing you to equip them alongside your Crafted Mythic.
Blacksmith Mythic Caches
The Blacksmith's Mythic Cache recipe is also changing.
These caches can now contain either a Mythic Unique or an Iconic Mythic that is valid for your class.
Items obtained through Mythic Caches will not receive the Crafted tag.
This also gives players another way to spend excess Resplendent Sparks without requiring additional Runes.
Unique Versions of Iconic Mythics
Iconic Mythics will now also have regular Unique versions.
The idea is to make these build-defining effects accessible earlier in character progression rather than forcing players to remain on a transitional build until they finally obtain the Mythic version.
Players can then eventually progress toward the stronger Mythic version as they continue developing their character.
Mythic Unique Charms
The Talisman system is expanding again with Mythic Unique Charms.
Existing Unique Charms will have a small chance of dropping at Mythic quality.
Like other Mythic items, their properties will roll at their maximum values, while their Unique effects will receive a substantial increase in power.
There are a few important differences between these and normal Mythic crafting:
Mythic Unique Charms cannot be crafted and cannot be specifically target farmed.
Instead, any Unique Charm has a small chance of dropping as its Mythic Unique version.
PTR players will have an easier way to experiment with them through the PTR vendor, Mrak.
New Unique Charms
Season 15 is also introducing 16 additional Unique Charms based on existing Unique items that previously didn't have Charm versions.
Eight of the returning Legacy Uniques will also receive corresponding Charms.
This should significantly expand the number of options available within the Talisman system and create even more combinations for players to experiment with
Rebirth
Rebirth changes how you can start a new Diablo 4 season.
Instead of creating a completely new character every season, you can select one of your existing Eternal characters and Rebirth them into the Seasonal Realm.
The character will return to Level 1, allowing you to begin the new season while maintaining that character's identity.
Diablo 4 will also keep track of the character's total hours played across their different Rebirths.
What Rebirth Keeps
Your Reborn character retains:
Class
Name
Appearance
Normal or Hardcore status
Transmogs
Pigments
Mounts and accessories
Pets
Portals
Headstones
Remove Your Items Before Using Rebirth
This is extremely important.
Move your character's equipment and inventory into your Eternal Stash before using Rebirth.
Items remaining on the character cannot come with you into the Seasonal Realm.
The game will warn you before completing the process and will require the character to have no equipped items or items remaining in their personal inventory before Rebirth can be completed.
This is something you'll definitely want to double-check before starting the new season, especially if you're Rebirthing an older character with valuable equipment.
Horadric Post
Finally, Diablo 4 is introducing the Horadric Post, a new system for delivering messages and rewards directly to your account.
Think of it as an in-game mailbox specifically for receiving items from the Diablo 4 team.
The Horadric Post can contain things such as:
Rewards
Supplies
Commemorative items
Other important account deliveries
During the PTR, players will receive an early commemorative reward as part of testing the system ahead of Season 15.
The Horadric Post is a one-way system, so you won't be sending messages or items through it. Instead, it provides Blizzard with a direct way to deliver rewards and special items to players.
Season 15 Is Taking Shape
Between Soul Splinters, Challenge Dungeons, Legacy Uniques, Mythic crafting changes, new Charms, Rebirth, Overland Ambushes, and the Horadric Post, Season 15 is introducing changes across nearly every part of Diablo 4.
The biggest theme appears to be player choice.
Soul Splinters ask you to balance powerful bonuses against meaningful drawbacks. Challenge Dungeons allow you to push beyond your current Torment difficulty. Mythic crafting gives you more control over your most important items, while Rebirth provides another option for how you begin a new season.
Keep in mind that many of these systems are being tested on the PTR, which means values and mechanics can still change before Season 15 officially launches.
I'll continue covering the changes as we learn more and as these systems evolve heading into the new season.