Blizzard Entertainment has unveiled the details for Diablo IV Season 10, titled Infernal Chaos, set to begin on September 23, 2025. This update introduces a wealth of new features, including the powerful Chaos Armor system, the experimental Chaos Perks mechanic, and the dangerous new endgame boss, Bartuc, Lord of Chaos. Alongside these additions, players will encounter Chaos Rifts across Helltide zones and Nightmare Dungeons, providing fresh opportunities for loot and seasonal progression.
Season 10 also delivers major updates to the Infernal Hordes activity, such as Chaos Waves and Fleeting Hordes, while several permanent improvements are being introduced to the game, including new unique items for all classes and improved boss mechanics. With its blend of seasonal exclusives and lasting content, Infernal Chaos emphasizes build diversity, endgame challenge, and quality-of-life enhancements for all players.
Full Patch Notes
Major New Features
- Chaos Armor System
- Unique armor variants can now drop in different slots than their original versions
- Example: Fists of Fate can now appear as a helmet instead of gloves
- Always drop with maximum power and at least one Greater Affix
- Available for all classes with extensive unique item lists
- Guaranteed drops from Bartuc in Torment III-IV
- Bartuc, Lord of Chaos – New Boss
- Accessible through Infernal Hordes using Aether investment
- Features chaos portals, teleport mechanics, and 10-second invulnerability delay
- Primary source of Chaos Armor and Unique Chaos Perks
- Chaos Perks System
- Four rarity tiers: Magic, Rare, Legendary, Unique
- Equip up to 3 non-Unique plus 1 Unique perk simultaneously
- Includes class-agnostic and class-specific variants
- Significantly alters skill functionality and build options
- Upgraded using Infernal Warp currency
- Chaos Rifts
- Appear in Helltide zones and Nightmare Dungeons
- Spawn demons and chaos monsters
- Reward seasonal reputation, Infernal Warp, and loot
- Special Chaos Rift Nightmare Dungeons with enhanced rewards
Infernal Hordes Updates
- Chaos Waves
- New volatile encounter between standard waves
- Increased difficulty with greater Aether rewards
- Mechanics include dodging projectiles, slaying Hellwyrms, and hunting Aether Goblins
- Fleeting Hordes
- Streamlined 4-wave version for pre-Torment difficulties
- Limited offerings and ends with 2 Fell Council members
Quality of Life
- Faster door opening
- Rebalanced Infernal Offerings
- Enhanced Fell Council with new Speaker mechanics
New Unique Items
- Barbarian: Sabre of Tsasgal (damage scaling weapon)
- Druid: Kilt of Blackwing (Raven enhancement pants)
- Necromancer: Gospel of the Devotee (Basic skill empowerment focus)
- Rogue: Orphan Maker (Reload mechanic crossbow)
- Sorcerer: Galvanic Azurite (Lightning magnetization ring)
- Spiritborn: Hesha e Kesungi (Protector enhancement gloves)
Permanent Changes
- Infernal Hordes updates remain (Chaos Waves, Bartuc, Fell Council improvements)
- New unique items for all classes stay available
- Boss invulnerability refined with 10-second delay and breakable shields
Season-Only Features
- Chaos Perks, Chaos Armor, Chaos Rifts
- Fleeting Hordes, seasonal questline
- Viz-Jaqtaar reputation system
Seasonal Progression
- Currency: Viz-Jaqtaar Veneration
- Activities: Sealing Chaos Rifts, defeating Chaos Monsters
- Questline: Investigate corruption with assassin Shyan
- Battle Pass: Infernal Chaos reliquary, Feathermane Mount, and cosmetics
Diablo IV is a 2023 action role-playing game developed and published by Blizzard Entertainment. Released on June 5, 2023 for PlayStation 4, PlayStation 5, Xbox One, Xbox Series X and S, and Microsoft Windows, the game allows players to choose from six classes including Barbarian, Druid, Necromancer, Rogue, Sorcerer, and Spiritborn. The title combines dungeon-crawling and loot-driven gameplay with a new open world and player-versus-player elements. Its first expansion, Vessel of Hatred, arrived in October 2024, while Season 9: Sins of the Horadrim launched on July 1, 2025. Season 10, Infernal Chaos, officially begins on September 23, 2025.
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