
Mechanicum · The Horus Heresy
Thanatar Cavas Siege-automata
GW Item #: 99123016007
Last checked: 4/5/2026
Thanatar Cavas Siege-automata — Price Summary
Thanatar Cavas Siege-automata retails for $106.00 at Games Workshop (Mechanicum, The Horus Heresy). 3 authorized retailers carry it in the US and 3 have it in stock.
Cheapest right now: $90.10 at Discount Games Inc — that's $15.90 less than GW (15% off). Prices update every 4 hours.
The table below has all 3 retailers with current prices and stock. More Mechanicum kits on the faction page.
Product Description
The Thanatar Siege-automata is a mobile artillery platform rather than a general battle unit, with a heavy frame built to accommodate its huge weaponry and requisite power systems. The Thanatar-Cavas configuration is armed with a Hellex pattern plasma mortar, a terrifying weapon that launches spheres of plasma into the heart of enemy fortifications. The origins of the Thanatar-Cavas remain uncertain, save that its armament is known to be the product of the forge world of Ryza, the sole locale where Hellex pattern weaponry is produced. This multipart plastic kit builds a Thanatar-Cavas Siege-automata, a hulking demolisher robot fielded by the Mechanicum in the age of the Horus Heresy. The Thanatar's primary weapon is a huge shoulder-mounted plasma mortar, which can be built with its firing aperture open or closed. Its arms are tipped with claw-like shock chargers, and its left arm also features a wrist-mounted twin mauler bolt cannon. The kit features plenty of posing options to personalise your Thanatar-Cavas, including joints for the waist and shoulders, three right arm poses, two left arm poses with ammo feeds to match, and the ability to build the shock chargers in different grabbing positions. This kit contains 175 plastic components and a Citadel 120mm Round Base. This set also includes 1x Mechancium Macro-constructs Transfer Sheet containing 394x high-quality waterslide transfers for you to use to customise your miniatures. These miniatures are supplied unpainted and require assembly – we recommend using Citadel Plastic Glue and Citadel Colour paints.
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