Legions Imperialis – Dark Mechanicum Serperos Overlord Heavy Stalkers
The second set from the Dark Mechanicum for Legions Imperialis are the Serperos 'Overlord' Heavy Stalkers and they complement the lighter Stalker Construct to flesh out the Mechanicum lists for the traitor forces.
This set goes for pre-order today on December 7th and will be released on December 21st 2025, at a RRP of 41 EUR.
The constructs are new designs to the Horus Heresy, and haven't been seen before neither in 28-32 nor epic scale. As Games Workshop uses the larger models for the product pictures on Titanicus, Aeronautica and Imperialis, we actually get a preview on the upcoming models right there on the boxes. With this kit we get four models of the new Serperos Heavy Stalker design.
Legions Imperialis – Dark Mechanicum Stalker Constructs
In addition to the Mechanicum release for Legions Imperialis, Games Workshop added the first sets for the Dark Mechanicum, the Stalker Constructs and Serperos Overlord Heavy Stalkers - both of which we're going to cover today, but starting with the Stalker Constructs here.
This set goes for pre-order today on December 7th and will be released on December 21st 2025, at a RRP of 41 EUR.
These are entirely new designs added to the game. We had obviously Dark Mechanicum in the lore in the past, as a playable faction as well, but never written out in detail. And to give the "full scale" Horus Heresy folks a heads up. Games Workshop uses the 28-32mm models for the box art with all the epic scale products (they did so with Adeptus Titanicus and Aeronautica Imperialis) and what we see on the packaging is most certainly the upcoming model for the Horus Heresy.
Legions Imperialis – Mechanicum Triaros Squadron
Within the Mechanicum Battle Group for Legions Imperialis are not only infantry and walkers, but an armoured transport vehicle as well - the Triaros Armoured Conveyor as a squadron of four. We even recently covered the 32mm variant plastic kit from the Horus Heresy range on here as well.
Currently only available as part of the Mechanicum Battle Group the Triaros Squadron will be available as a set of its own shortly. As usual we get two identical sprues, the instructions are part of the combined booklet and at least as part of the Battle Group it does not come with decals. But this was the case with any of the vehicle kits from the Legiones Astartes or Solar Auxilia, and if you ask me the icon on the side doors of the Triaros shown above are decals as well, so we might see these in a later release.
Legions Imperialis – Mechanicum Thanatar Siege-Automata
Another kit that we just recently build in full scale of Horus Heresy, the Mechanicum Thanatar Siege-Automata. And while the larger brother is currently "just" available as the Thanatar Cavas Siege Automata, the new sprue as part of the Mechanicum Battle Group covers both, the Cavas and Calix Siege Automata.
Availability currently limited to the Battle Group, we will see this box of 8 of the Thanatar Siege-Automata somewhere in the close future at a RRP of 41 EUR, covering two identical sprues and eight bases with 32mm diameter.
Legions Imperialis – Mechanicum Battle Automata
In between the regular Mechanicum Infantry and the largest of the Siege Automata are various classes of Battle Automata the (Dark) Mechanicum can muster, and that is another new set as part of the Mechanicum Battle Group.
This set combines five different Battle Automata, with the first time we've seen the Arlatax Battle-Automata and small versions of the Castellax, Domitar and Vorax Battle-Automata as well as the Vultarax Strato-Automata.
Legions Imperialis – Mechanicum Infantry
Among the sets from the Mechanium Battle Group is a whole new set of Mechanicum Infantry with quite a lot of units covered in a single kit. As of today these only available through the battle group but will be released as individual kits soon.
The RRP of the Battle Group is 125 EUR for four sets of different Mechanicum units, compared to 41 EUR RRP for a single set of two sprues with bases (25mm round in this set) and an instruction leaflet.
Legions Imperialis – Mechanicum Battle Group
A proper start for the Mechanicum in Legions Imperialis, not with single boxes but directly with a Battle Group boxed set and a new campaign supplement The Rise of the Dark Mechanicum to cover the rules for these new units.
This trend to introduce new units as a bigger boxed set is something that we saw for a while now with the Horus Heresy, we received the "full scale" Mechanicum this way, the Solar Auxilia and most of the updated Marks for the Legiones Astartes.
The Mechanicum Battle Group is available as of today (October 19th) for pre-order and will be released on Saturday November 2nd 2024.
The way Games Workshop counts the miniatures for Legions Imperialis is a bit irritating, as they count each model individually (for example crew of weapon platforms count as individual models), so the 40 Tech-Thralls boost that number quite a bit. In this case you get 146 miniatures in their epic scale for 95 GBP / 125 EUR RRP. Unlike the two other Battle Groups for Solar Auxilia and Legiones Astartes, the Mechanicum "only" covers four boxes instead of five, which is the reason why this boxed set is a bit cheaper than the other ones. What individual kits these are, will be answered further below.
Horus Heresy – Mechanicum Thanatar Cavas Siege-Automata
Along with the individual kits from the Mechanicum Battlegroup there are three novelties for pre-order this Saturday, the new supplement for Horus Heresy - The Martian Civil War, an Archmagos Prime and the Thanatar Cavas Siege-automata. The last one we're going to build today.
The Thanatar Automata is the largest walker, that is not a Knight, within the ranks of the Mechanicum and a former resin kit, available in the Cavas or Calix Siege-Automata variants. With the Cavas being the first to the produced in plastic. But don't worry, you will see it further below, the kit (or rather the sprues) are designed in a way, that the armament can be swapped and the Calix variant will likely be covered with a weapon sprue of its own.
Horus Heresy – Mechanicum Triaros Armoured Conveyor
And last but not least, we want to take a look upon the Triaros Armoured Conveyor. The largest model from the newly released Mechanicum Battle Group and another huge improvement for the range, as the former resin kits of this size provide a serious challenge for the hobbyist.
Among the vast range of walkers and robots within the Mechanicum, there are still tanks and tracked vehicles available for roles like tanks, self-propelled guns or transporters. There are multiple patterns and vehicles, where the Triaros Armoured Conveyor with its transport capacity of up to 22 models (for example tech thralls or light automata) shares his chassis with the Karacnos Assault Tank. Other tracked vehicles, like the Krios use a different chassis, but a similar design.
Horus Heresy – Mechanicum Castellax Battle-automata
The third infantry unit from the new Mechanicum Battle Group are the Castellax Battle-Automata. Another former resin kit, recreated in hard plastic.
While being quite bigger and carrying a heavier punch than the tech-thralls and thallax cohort, these still count as a troop choice and you can use a single miniature as a maniple of its own and add up to 4 further Castellax Battle-Automata to that unit.
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