Hello everyone! This is a list to play a 30k/Horus Heresy Thousand Sons legion army--of either Loyalist or Traitor allegiance--that I put together with the help of other community members on the Tactical Command Discord server. It is mostly made with Legions Imperialis model kits in mind. Ideas were taken from Glyn's WIP Legiones Astartes general army list, as well as the AU30k Legiones Astartes list of units.

The XVth Legion Astartes - Prosperine Congregation army list represents a gathering of the 30k Thousand Sons' orders and Cults to combine their psychic might into a formidable force. Almost every unit in the list is high value; this is both the army's biggest strength and weakness. You'll have access to powerful psychic abilities and synergies, but the points to purchase access to these special rules across your army add up. This makes your army a small and elite force by even Space Marine standards, meaning you'll have to build and maneuver your army prudently and selectively.

How this works is that several formations in the army either have access to purchase a Cult Arcana Upgrade to receive a Cult Arcana (X) special rule, or already have a Cult Arcana (X) special rule baked into their units. The effects of Cult Arcana (X) depend on the variant of "X" that it has; this can be Pyrae, Corvidae, Raptora, etc. To use any Cult Arcana (X) ability, a formation must pass an initiative roll. If it fails, the formation targeted for the Cult Arcana (X) benefit receives a Blast marker. Additional penalties vary depending on the variant of "X".

To my knowledge as of typing this, the list has not yet been playtested, which is why it is currently an Experimental list. The goal is to eventually get it to an Approved status. Of course, feedback, advice, and contributions are very much appreciated. I hope this list brings a lot of fun to your table and an opportunity to bring more of your models into play. Thank you for your interest, to Glyn for the backbone of this list, and to all those who gave feedback in the Discord!

Edit (2026/04/19): v0.0.2b has been released!
Edit (2026/04/22): v0.0.2c has been released!

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Hello everyone! Here's a small update for the army list. It's mostly thinning and tidying, but I hope the list is better for it. Let me know how it looks, and thank you in advance for your interest!

v0.0.2b:
- The cost of the Storm Eagle Gunship was increased to 150 points.
- Battlesmith was clarified for embarked units.
- The Ardex Mega Bolters were split into two Ardex Mega Bolter weapons with the same total number of attacks.
- The following formations were removed for thematic focus: Deredeo Dreadnought Talon, Leviathan Dreadnought Talon, Kratos Heavy Assault Tank Squadron, Caestus Assault Ram, Mastodon Super-heavy Assault Tank, Fire Raptor Gunship Squadron.
- Both Sicaran units were given Scout and increased to 100 points each. The Sicaran Battle Tank Squadron was reduced to two units.
- To reign in activation count and open the possibility of proper Legio Xestobiax representation in the army list, the Warhound/Dire Wolf formation count was limited; A Warlord or Reaver formation must be selected for every Warhound/Dire Wolf formation selected.
- One in four Legion Breacher Squad units now have a Lascutter.
- Legion Devastation Class Cruiser units now only transport infantry, Dreadnoughts, Legion Thunderhawk Gunships, and Legion Drop Pods.
- The Legion Xiphon Interceptor unit no longer has Close Combat and Firefight values.

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Hello again, everyone! I've had a good amount of free time since my last post in this thread, and I've been fortunate enough to receive quick feedback from Queen of Bithynia about the list. Thus, I made changes to further clarify and slim down the list, as well as make the Cult Arcana rules easier to understand and reference. I hope that these changes are (at least) mostly successful in this regard, so let me know whether they actually are. Thank you again for your interest!

v0.0.2c:
- Some existing formation rules were reworded or fixed.
- The Legion Outrider Squad unit was removed. In its place, the Legion Sky-hunter squad unit's CC was upgraded to 3+.
- The Warhound Class Titan unit and Dire Wolf Class Titan unit were removed entirely to focus the list further. Coincidentally, this is in character for Legio Xestobiax.
- The Khenetai Occult Blades formation was renamed to Khenetai Occult Blade Cabal; the Khenetai Occult Cabal unit was renamed to Khenetai Occult Blade Squad.
- The Ammitara Intercession Cabal formation was renamed to Ammitara Occult Intercession Cabal; the Ammitara Occult Intercession Cabal unit was renamed to Ammitara Occult Intercession Squad.
- Legion Tactical Squads formations and Khenetai Occult Blade Cabal formations can no longer take the Spartan Assault Tank Squadron Legion Upgrade.
- One Legion Breacher Squad unit in every two now has a Lascutter. Accordingly, the Legion Breacher Squads formation was increased in cost to 350 points.
- Sicaran Battle Tank Squadron formations can now have 2 OR 4 units.
- Legion Predator units were removed.
- The Hyperios Missile Launcher on the Legion Hyperios Missile Tank was renamed to a Twin Hyperios Launcher.
- The Cult Arcana (X) rules were overhauled. Making an Initiative roll to use a Cult Arcana (X) ability and receiving a Blast marker upon failure is now standardized across all variants. Each variant description is divided into three sections: Time, which describes the moment that a Cult Arcana (X) ability can be used; Success, which describes what the targeted formation gains upon succeeding the Initiative roll; and Failure, which describes the penalty the targeted formation receives upon failing the Initiative roll, on top of the Blast marker inflicted. Ideally, the rules should be easier to reference as well. Some clarifications were also made and some smaller details were reworded.
- The XVth Legion Astartes Forces unit list is now down to two pages long, save for the Legion Drop Pod rules that spill over to a third page.
- The Special Rules section now fits on a single page with room to spare.
- NOTE: Removal of some War Engine tank units in the army list was considered, but it was decided that they would remain. This is to prevent the list from becoming rigid in smaller games or game modes (e.g. Minigeddon). In addition, it is not expected for there to be more than two of these tank units selected for a viable list in a medium-sized game (3k points) due to existing restrictions.

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Remember that Jesus loves you.