A comprehensive analysis of Age of Sigmar's 4th edition core mechanics and the Ossiarch Bonereapers' transformation, featuring their reimagined Relentless Discipline system and exciting new units from the 2026 preview.

The new ability system is probably the biggest change since Age of Sigmar launched. Everything—and I mean everything—is now an ability with clear timing, declare steps, and effects, creating much cleaner interactions.
Explain Age of Sigmar 4th edition core rules: focus on the new 'Ability' system, removal of Battleshock, and 'Regiment' army building. Specifically for Ossiarch Bonereapers, analyze the 2026 New Year Preview updates: Mortek Triaxes, new bone chariots, and the upcoming 2026 Battletome. Explain how 'Relentless Discipline' has changed in the new edition. Use a systematic, fact-heavy structure suitable for a returning veteran player.


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Jackson: Hey Eli, have you seen the latest news about Age of Sigmar's 4th edition? I've been digging through all the updates, and the changes to the Ossiarch Bonereapers are pretty substantial. That New Year Preview really showcased some impressive new units!
Eli: I have, and it's fascinating how they're evolving. The Ossiarch Bonereapers are getting a complete overhaul in this edition. What caught my eye immediately was how they're handling the Relentless Discipline mechanic - it's been completely reimagined.
Jackson: Right! In 3rd edition, they had their own command point system that was pretty unique. How exactly is that changing in 4th?
Eli: Well, instead of generating command points that only they can use, the new system creates a pool of points generated by heroes on the field. Katakros himself generates 10 points, while a Liege-Mortek creates 5. These points can then be spent on various abilities, with some gaining extra power when you invest additional points. It's a much more flexible system that maintains their unique identity while fitting into the new edition's framework.
Jackson: That sounds like a significant shift. And I noticed they're also getting some impressive new units like those Mortek Triaxes with their bone bows. You know, it feels like Games Workshop is really leaning into making each faction mechanically distinct in 4th edition.
Eli: Absolutely. The Triaxes are particularly interesting with their third eye that can see enemy auras before they break cover. They're clearly designed to give the Ossiarch Bonereapers some much-needed ranged capability. Let's break down how these new units and the updated Relentless Discipline system will actually work on the tabletop...