Sins of the Horadrim is Diablo IV’s ninth season, announced for July 1, 2025. Its seasonal story follows the fallout from Donan’s decision to seal Astaroth, while its gameplay systems focused on spell customization, Horadric Jewels, and more demanding Nightmare Dungeon activities. Those details describe Season 9 at launch; the available official information does not establish whether its seasonal content remains playable in the live game today.
What is Sins of the Horadrim?
Sins of the Horadrim is a seasonal chapter of Diablo IV, not a standalone game. Blizzard announced it as Season 9, with an all-platform version 2.3.0 build dated July 1, 2025. The season combined a story questline with temporary progression and combat systems.
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The season’s narrative, The Embers Yet Smolder, begins in Cerrigar. Druid Bryona confronts the consequences of Donan’s choice to seal Astaroth after defeating him. Blood Relics touched by Astaroth’s blood threaten to help demonic forces bring him back, and players are tasked with finding and purging them. Blizzard’s announcement describes the goal as preventing the relics from falling into demonic hands.
Blizzard also promoted the comic Apotheosis as a prequel to Season 9. It provides companion story context, but its announcement alone does not establish present-day availability or a particular edition.
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- Diablo IV is the next-gen action RPG experience with endless evil to slaughter, countless abilities to master, nightmarish Dungeons, and legendary loot.
- Embark on the campaign solo or with friends, meeting memorable characters through beautifully dark settings and a gripping story, or explore an expansive end game and shared world where players can meet in towns to trade, team up to battle World Bosses, or descend into PVP zones to test their skills against other players - no lobbies necessary - with cross-play and cross-progression on all available platforms.
How players began the Season 9 quest at launch
Blizzard’s launch instructions applied to starting the seasonal quest on the Seasonal Realm. They required completing the base-game campaign and creating a new Seasonal Realm character.
- Complete Diablo IV’s base-game campaign.
- Create a new character on the Seasonal Realm.
- Travel to Cerrigar and find Bryona northwest of the Waypoint to begin The Embers Yet Smolder.
These were the stated launch-era requirements for the seasonal quest; they should not be read as current requirements for other game modes.
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How Horadric Spellcraft worked
Horadric Spellcraft let players combine three kinds of components to customize spells and connect them to abilities. Blizzard described Catalysts as the spell’s base power, Infusions as the way to change its elemental damage type, and Arcana as modifiers to its baseline power.
- Catalysts: establish a spell’s base power.
- Infusions: change the spell’s elemental damage type.
- Arcana: modify its baseline power.
The intent was to let players build combinations suited to their playstyle rather than use a single fixed spell setup. These are Season 9 system details, not confirmation that Spellcraft is currently available.
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Strongrooms and Escalating Nightmares added dungeon challenges
Horadric Strongrooms
Strongrooms were hidden micro-dungeons found inside Nightmare Dungeons. The seasonal questline granted access to the Horadric Wayfinder, which players used to find them.
Escalating Nightmares
Escalating Nightmares were a new endgame activity built around increasing a dungeon’s intensity. Together, the two features extended the Nightmare Dungeon loop with optional discoveries and a more demanding progression challenge.
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Horadric Phials, Knowledge, and Jewels
At launch, Horadric Phials could be earned in Nightmare Dungeons, Nightmare Escalations, Strongrooms, and Lair Boss Hoard Chests. Players could exchange them for Horadric Knowledge at the Lapidary or use them to craft Horadric Jewels.
Blizzard’s 2.3.0 PTR preview described Horadric Tomes as consumables used to enable Horadric Jewel crafting at Wayfinders. The preview said crafting used Horadric Phials and Gem Fragments, and that the resulting socketable Jewels could be placed in amulets and both ring slots. As this detail comes from a PTR preview, it records the system Blizzard previewed; the patch notes are the launch-era record of the released version.
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- Forge your path through Sanctuary - a continuous, ever-growing, and fully explorable world, filled with choices, quests, corruption and loot.
- Create and customize your character to face the darkness. Choose from one of five classes and forge a hero that is uniquely your own with cosmetics, talents, and abilities.
- Defeating great evil requires great gear. Discover and experiment with a vast arsenal of powerful weapons, armors, and more to fight back against the demons threatening these lands.
A Season 9 exchange rate that was explicitly temporary
After launch, Blizzard reported that Patch 2.3.3 changed the Substantial Horadric Knowledge exchange to grant 4,000 Horadric Knowledge for 2,000 Horadric Phials. Blizzard stated that this rate would last only until the end of Season 9, so it is a historical seasonal figure—not a current exchange rate.
What is known about availability now?
The official material establishes Season 9’s announced story, launch instructions, systems, and dated patch changes. It does not establish whether the seasonal realm, quest, rewards, or every Season 9 mechanic remains accessible in the live game as of October 8, 2026. Treat the features above as a record of the season’s announced and launch-era design, not a guarantee of current availability.
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