Spoilers: The Old World account of his regalia, and Garagrim's place as a later hero. No death in battle.

Who he is in Total War
Ungrim leads Karak Kadrin. Total War: Warhammer unlocks him with Thorgrim Grudgebearer. The June 2022 Immortal Empires list places him at Karak Kadrin, north of the High King's hold. He is a melee lord aimed at large enemies, with Slayers as the aggressive part of a throng that still needs Dwarf Warriors to hold and Irondrakes to shoot. The shared grudge system and the Deeps sit under that Slayer emphasis.
Immortal Empires keeps him at Karak Kadrin. Garagrim Ironfist, his son, is a separate legendary hero from Malakai – Thrones of Decay. Owning the first game and owning that hero are two purchases.
Slayer Crown and Axe of Dargo
Warhammer Community's mountain-holds almanack is The Old World, an earlier period than the Total War High King. In that period High King Alrik Alriksson still rules at Karaz-a-Karak, and Ungrim is alive, more aggressive, and not yet wearing the Dragon Cloak. He does have the Slayer Crown and the Axe of Dargo. The Slayer vow and the oath of kingship both bind the line, and he seeks a queen because the hold still needs an heir who can carry both.
The battle almanack calls him king of the Slayer Hold and says a Royal Clan general in his mould can build a Slayer-heavy army. The miniatures almanack repeats the double oath: the vow has dogged the bloodline, and the Oath of Kingship sits on top of it. The Dragon Cloak, when the later king wears it, belongs to that later presentation. Age of Sigmar warscrolls are a different game, with their own numbers.
The other Dwarf lords
Thorgrim keeps the Great Book at Karaz-a-Karak. Belegar's Clan Angrund is trying to retake Karak Eight Peaks, and the 2022 list starts him at Zarakzil. Thorek's Immortal Empires start is Karak Zorn. Grombrindal's Ancestral Throng is at Dracla Spire, in the campaign that moves him toward Naggaroth and Malekith. Malakai's Masters of Innovation are the engineering expedition, and the airship in Daemonslayer is a different voyage from the game's Spirit of Grungni.
The Slayer Hold, the two oaths, and Garagrim's recruitment are the public story. A campaign that marches north from Karak Kadrin is the player's war, including which grudges he settles and which holds he develops underground.
Ungrim Ironfist: gameplay and availability · More character stories
Sources
- Immortal Empires DLC Ownership Guide — SEGA — support.sega.com
- Immortal Empires starting positions, a prologue — Total War — totalwar.com
- Old World Almanack: the Dwarfen mountain holds — Warhammer Community — warhammer-community.com
- Old World Almanack: how the holds fare in battle — Warhammer Community — warhammer-community.com
- Old World Almanack: old miniatures and new — Warhammer Community — warhammer-community.com
- Immortal Empires DLC Ownership Guide — support.sega.com
- Thrones of Decay: Introducing Malakai Makaisson — community.creative-assembly.com
- Patch 5.2.0 — community.creative-assembly.com