The Mark X Gravis armour is the heavy, reinforced pattern of the Mark X power armour worn by Primaris Space Marines. It trades agility for bulk and protection, letting Marines carry the biggest weapons and soak up more punishment than their battle-brothers in standard Tacticus plate.
What the Mark X Gravis armour is
Gravis is one of several patterns within the Mark X family, alongside Tacticus, Phobos, and Omnis. Where Tacticus is the all-rounder and Phobos is the light, stealthy option, Gravis is the heavyweight: thicker plating, bigger shoulder pads, and extra armour over the chest and limbs.
It’s still fully sealed power armour, so the wearer keeps the usual ceramite shell, fibre-bundle muscles, auto-senses, and backpack fusion plant. Gravis just adds more of all that, which is why it looks so chunky.
Why it matters on the tabletop and in lore
Gravis is the armour you give a Marine when you want him to stand in the open and keep shooting. It shows up on units like Aggressors, Inceptors, Eradicators, and Heavy Intercessors, all of which need to lug around heavy weapons or weather return fire.
In the lore, Gravis represents the Primaris project’s push to give Marines more staying power without going all the way to Terminator armour. It’s a middle ground: tougher than Tacticus, more mobile than Terminator plate.
How it compares to other Mark X patterns
| Pattern | Role | Notable traits |
|---|---|---|
| Tacticus | Standard line infantry | Balanced protection and mobility |
| Gravis | Heavy assault and fire support | Extra plating, larger silhouette |
| Phobos | Recon and stealth | Lightweight, quieter, less armour |
| Omnis | Assault troops | Jump pack integration, mid-weight |
Key limitations and quirks
Gravis isn’t a straight upgrade. The extra mass slows the wearer, and it’s not as protective as Terminator armour or as nimble as Phobos. It’s a specialist tool, not a replacement for everything else.
Sources don’t always agree on exactly how much heavier Gravis is than Tacticus, or whether every Chapter fields it in the same numbers. The broad picture is consistent, though: it’s the heavy option within the Mark X line.
Key facts
- Gravis is a heavy pattern within the Mark X power armour family, worn by Primaris Space Marines.
- It offers more protection than Tacticus but less mobility, sitting between standard power armour and Terminator plate.
- Common wearers include Aggressors, Inceptors, Eradicators, and Heavy Intercessors.
- Like all Mark X armour, it’s fully sealed and powered by a backpack fusion plant.
- Sources differ on exact weight and deployment numbers, but agree on its heavy, reinforced role.
FAQ
Is Gravis armour the same as Terminator armour?
No. Gravis is a heavier pattern of Mark X power armour, but it’s still lighter and more mobile than Terminator plate. Terminators get even thicker armour and often a storm bolter or heavy weapon built into the suit.
Which units wear Gravis armour?
Common examples include Aggressors, Inceptors, Eradicators, and Heavy Intercessors. It tends to go to units that carry heavy weapons or need to hold ground.
Can any Space Marine wear Gravis armour?
In the lore it’s Primaris Marines who use the Mark X family, and Gravis is one option within that. Firstborn Marines generally stick to older patterns like Mark VII or Terminator armour.