Ironstorm Spearhead: The 11th-Edition Space Marines Armour Detachment

Ironstorm's rule lets each Adeptus Astartes unit re-roll one Hit roll, one Wound roll, OR one Damage roll, once per phase, in both shooting and combat. It is a per-unit, per-phase re-roll — not a single army-wide one — so the more hulls you field, the more consistency boosts you rack up every phase. The standout use is re-rolling Damage on big variable-Damage guns (think a low roll on a melta or battle cannon), turning feast-or-famine tanks into reliable ones. Because the benefit scales with vehicle count, Ironstorm is strong in an armour list and weak in an infantry one.

• Ancient Fury (Command phase) — buffs a Dreadnought with +1 to Move, Toughness, Leadership, Objective Control and to Hit. Use it on the Walker you're pushing up the board this turn so it arrives tougher and more accurate.
• Power of the Machine Spirit (opponent's Shooting phase) — a vehicle knocked below half wounds immediately shoots back at whatever just hit it. A dying tank's parting volley.
• Vengeful Animus — when a Deadly Demise vehicle is destroyed, it deals maximum mortal wounds automatically. Best when enemies are clustered around the wreck.
• Mercy is Weakness (your Shooting/Fight phase) — Sustained Hits against already-weakened enemy units (with easier crits for vehicles). A finisher to wipe a mauled squad.
• Unbowed Conviction — an under-strength unit ignores modifiers, shrugging off enemy to-hit and other debuffs.
• Armour of Contempt (defensive) — worsens incoming AP by 1. This is the universal Space Marine defensive strat and your bread-and-butter for keeping a key hull alive.

The best enhancements live on a Techmarine, which is close to an auto-include here:

• Target Augury Web (Techmarine) — each Command phase, give a nearby Vehicle Lethal Hits. The signature offensive enhancement; park it on your biggest gun platform.
• Adept of the Omnissiah (Techmarine) — once per round, change one failed-save hit on a nearby Vehicle to 0 Damage, negating a big incoming shot.
• Master of Machine War (any character) — lets a nearby Vehicle shoot even after it Advanced or Fell Back, buying mobility without losing firepower.
• The Flesh is Weak (any character) — a simple Feel No Pain 4+ durability boost.

(Exact 11th-edition points weren't independently confirmed, so build against the current pack's costs.)

• Dreadnoughts (Redemptor, Brutalis, Ballistus) — the centrepiece: the only Ancient Fury targets, and Armoured Wrath smooths their variable-Damage weapons.
• Gladiator tanks (Lancer/Valiant/Reaper) — premier gun platforms that love Lethal Hits from Target Augury Web plus Damage re-rolls.
• Repulsor Executioner — heavy weight-of-fire and a natural anchor for the defensive toolkit.
• Techmarine — enables the best enhancements and repairs your linchpin vehicle; near-mandatory.
• Vindicators, Predators, Land Raiders — classic armour spam that benefits from army-wide re-rolls and the durability stratagems.

Choose Ironstorm when your collection leans on multiple tanks and Dreadnoughts and you want to play a durable, grinding gunline rather than an infantry or assault army. Compared with the flexible generalist Gladius Task Force or the infantry-oriented Anvil and Firestorm detachments, Ironstorm hands every vehicle a free per-phase re-roll plus a tank-centric stratagem and enhancement suite. Its power scales directly with hull count — bring 4-6+ vehicles/Walkers to get full value.

Sample gameplan: field a heavy armour core plus a Techmarine. Weather the opponent's alpha strike with Armour of Contempt and Adept of the Omnissiah on your key tank. Each Command phase, put Target Augury Web on your biggest gun and Ancient Fury on the Dreadnought you're advancing. Spend Armoured Wrath re-rolls on Damage, use Mercy is Weakness to finish weakened squads, and turn dying tanks into value with Power of the Machine Spirit and Vengeful Animus. Grind the midboard with armour the opponent struggles to shift.