Warhammer Community showcases versatile MkIV Space Marines for Horus Heresy builders

Warhammer Community’s June 24 look at the new MkIV Space Marines made the release feel less like a single unit drop and more like a hobby toolkit. The new miniatures were presented as fully compatible with the range of Horus Heresy upgrade sets, a detail that immediately changes how a Legion force can be planned, posed, and painted.

That flexibility sits on top of some strong lore weight. MkIV, or Maximus armour, was described as the most technologically advanced armour available to the Legiones Astartes during the Great Crusade, when lost technology and rare materials were flowing into Mars. The Horus Heresy shattered that flow, and the collapse of supply lines and the fracture of the Mechanicum kept MkIV from spreading as widely as it might have. The Warmaster still made sure favored Legions, especially the Sons of Horus, received large stocks, which helps explain why the armour mark remains so closely tied to Heresy-era identity.

For builders, the release wave points to a lot more than a line infantry box. The first wave includes 20 Tactical Legionaries and 10 Assault Legionaries in MkIV armour, with the Assault Legionaries also buildable as Veteran Assault Marines armed with power lances. The Maximus Battle Group goes further, adding a Contemptor Dreadnought and a Sicaran Battle Tank, which gives collectors a full anchor for a Legion force rather than a lone squad to slot into an existing pile of plastic.

The practical hobby payoff comes in the kit’s conversion language. Warhammer Community noted that the MkIV Tactical Squad includes vambraces so arms from the Special Weapons, Heavy Weapons, and Melee Weapons sets can be converted to look more like standard MkIV arms. That matters when you are mixing parts across squads, because it helps a force read as one unified Legion while still letting each unit carry its own identity. The same article pointed to build ideas such as Veteran Tactical Squads, Praetorian Command Squads, Heavy Support Squads, Despoiler Squads, and even Rapier Battery crew, showing how one core frame can be pushed into very different battlefield roles.

That also matters at the painting table. Tactical Support Squads can be armed with plasma guns, meltaguns, volkite chargers, or rotor cannons, while Heavy Support Squads need the right arms to pose heavier weapons convincingly. Weapon choice, torso angle, and arm position all shape how a model looks before paint ever goes on, and that is where MkIV’s modularity becomes a real advantage. The result is a Legion force that can stay visually coherent across repeated infantry units without falling into duplicate-pose monotony.