Spoilers: The Orthodoxy’s place beside the Ice Court. No campaign ending.
Supreme Patriarch in the campaign
Kostaltyn leads The Great Orthodoxy. SEGA’s 18 June 2026 ownership table places him in the Warhammer III base game with Katarin and Boris Ursus. Selecting his faction is a base-game Kislev start. Mother Ostankya remains the Shadows of Change lord, and the Golden Knight joins only when that pack is owned and her mission chain is complete.
He is a melee leader whose religious support belongs with the soldiers holding a point. Patriarchs extend that support. A Frost Maiden is the army’s Ice or Tempest caster, a different job from his hymns. War Bear Riders answer a flank while the centre of Kossars and Streltsi stays intact. Moving him deep into an enemy formation, away from the troops he is meant to support, drops the reason to take him.
A faith beside the crown
The Great Orthodoxy is the religious counterpart to Katarin’s Ice Court. Patriarchs rally soldiers through faith and battle hymns. The queen and the cult can share a war against Chaos and still disagree about who directs Kislev. Kostaltyn is the lord who makes that disagreement a faction.
Patch 6.1 replaced an older contest, in which the Orthodoxy tried to outpace Katarin, with Court & Orthodoxy. Support develops the institutions and earns Boons. Distrust of the Ice Court in the political background is not a reason to ignore the province tools both campaigns share. Devotion, invocations and Atamans still belong to a Kislev settlement under his rule.
Katarin, Boris and the witch
Katarin holds the crown and the Ice magic of the Court. Boris Ursus is her father in the succession the game gives her, and he leads the Ursun Revivalists rather than the Orthodoxy. Kostaltyn does not replace either of them. The three base-game lords are alternative campaigns inside one race.
Ostankya’s guardianship sits further aside. Her witchcraft, her cauldron and her choice between a distant start in Naggaroth and a return toward Kislev are a Shadows of Change campaign. The Orthodoxy’s hymns are not the Lore of the Hag. Choosing Kostaltyn means choosing religious support, then recruiting the casters and cavalry the army still lacks.
What the campaign does not decide
Immortal Empires uses his faction in the sandbox. The Realm of Chaos is a different Kislev narrative, centred on Ursun. Victories in either mode stay inside that playthrough. They do not become a history of the Orthodoxy, and they do not settle the Ice Court’s future.
Black Library’s Ambassador jackets name the court of Tsarina Katarin and the envoy sent to her. They are her novels. Kostaltyn’s published place is the game’s Supreme Patriarch and the religious faction on the June 2026 ownership table.
Kostaltyn: gameplay and availability · More character stories
Sources
- Immortal Empires DLC Ownership Guide — support.sega.com
- Total War: Warhammer III patch 6.1 — community.creative-assembly.com
- Patch 9.0.5 notes — store.steampowered.com