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Summarised from the free Games Workshop rules download named in the sources. Check the current Battle Profiles before a game.
Points, unit sizes and regiment options live in the free Battle Profiles download, last republished 29 July 2026. A newer Battle Profiles always replaces an older one, so check the current version before a game.
Unit picks are SprueSentry commentary, not part of the formation rule. The formation ability itself is summarised from the free Faction Pack: Fyreslayers.
Add 1 to save rolls for friendly Fyreslayers Infantry units while they are wholly within friendly territory. The bonus follows your half of the board, not your models.
The Infantry block you want holding your own objectives, where the save bonus actually applies.
See the box: price and offersFaction terrain that gives the defensive half of the board a reason to be worth standing on.
See the box: price and offersPrayer support that layers on top of the save bonus without leaving friendly territory.
See the box: price and offersYou pick exactly one battle formation for your army, so choosing this one means you do not take these.
How to play Forge Brethren, the Fyreslayers battle formation that adds 1 to save rolls for Infantry wholly within friendly territory.
Sprue Sentry strategy commentary for Age of Sigmar 4th edition, not official rules. Games Workshop updates points and rules regularly; always confirm against the current official rules and latest update before a game.
Forge Brethren is the defensive battle formation for Fyreslayers in Age of Sigmar 4th edition. It is often described as a general save bonus, and it is not.
SprueSentry strategy commentary, not official rules. Summarised from the free Faction Pack: Fyreslayers, page-stamped August 2026.
The formation ability is Bulwark of Molten Stone, and it is passive. Add 1 to save rolls for friendly Fyreslayers Infantry units while they are wholly within friendly territory.
An extra point of save on duardin infantry that already carry good armour is a serious durability jump, and unlike a ward it works against everything with a save roll.
The bonus follows your half of the board. Every model in the unit has to be inside friendly territory, so a unit straddling the centre line loses the save for the whole unit, not just for the models over the line.
That makes Forge Brethren an unusual choice for an army whose instinct is to walk forward. It is a formation for missions and match-ups where the points are on your side of the table, or where the plan is to make the enemy come to you and grind them down on ground you already hold.
Players who want to play the objective game rather than the kill game: hold your own half with cheap Infantry, contest the middle with your Magmadroths and Heroes, and win on points. It is also the best answer to a shooting-heavy opponent, because the save bonus applies to shooting as well as combat.
Pick Forge Brethren when the mission or the match-up means your Infantry will spend most of the game at home. If your plan is to push, Warrior Kinband rewards that instead, and the two formations pull in opposite directions, so do not try to build for both.
It is passive: friendly Fyreslayers Infantry units add 1 to their save rolls while they are wholly within friendly territory.
No. It only applies while the unit is wholly within friendly territory, so pushing your infantry over the centre line turns it off.
No. It applies to Fyreslayers Infantry units only.
Written by Sprue Sentry, grounded in the cited sources. Original commentary, not Games Workshop rules text.