Games Workshop Unveils Slaanesh Daemon Army List and Custodes Lore for Horus Heresy

Key points

• The new supplement, 'Journal Tactica – The Battle for the Signus Cluster: Assault on Kol,' was revealed during the Big Autumn Preview on September 18, 2026.
• The book introduces a new army list for the Daemons of Slaanesh, featuring units such as Fiends, Seekers, and Daemonettes.
• It includes updated profiles and rules for the Ephoroi Venatari-Proconsul, Hykanatoi Proconsul-Delegate, and the Gyrfalcon Jetbike Sodality.
• The release adds army-wide special rules and options for 'Exalted Sections,' representing corrupted Solar Auxilia units.
• Pre-orders for the supplement are expected to open soon, following the live reveal event.

Background

This announcement is part of the broader Big Autumn Preview, which our archive notes was scheduled for September 18, 2026, to reveal new content across multiple Warhammer franchises, including Warhammer 40,000 and Age of Sigmar. The event follows recent previews of other Horus Heresy content, such as the 'Judgement of Valdor' and Tzeentch daemon updates.

How outlets are covering it

Warhammer Community provides the primary details on the specific rules, unit profiles, and lore contained within the new Journal Tactica supplement, emphasizing the tactical additions for both Loyalist and Chaos forces. GamesRadar+ covers the event more broadly, listing the Slaanesh reveal as one of many announcements, including a new paint range and the 'Legion of the Damned,' but does not provide the granular rulebook details found in the primary source.

Why it matters

The release expands the playable options for Warhammer: The Horus Heresy by introducing a dedicated Chaos army list, allowing players to field Slaanesh daemons against Loyalist forces. It also deepens the lore of the Signus Cluster conflict, providing narrative context for the Legio Custodes' engagements beyond the Blood Angels' battles on Signus Prime.

What to watch

Pre-orders for the 'Journal Tactica – The Battle for the Signus Cluster: Assault on Kol' are expected to open soon. Players can also look for further reveals from the Big Autumn Preview, including updates for Warhammer 40,000 and Age of Sigmar.