Spoilers: Character background and the premise of the WH1 campaign An Eye For An Eye.

The Beastlord of the Drakwald
Khazrak leads through patience and control of the warherd. His background places him in the Drakwald, where he attacks settlements and roads, then evades the forces sent after him. The danger comes from an enemy capable of choosing the moment to fight and withdrawing before retaliation arrives.
He is associated with trained Warhounds and the ability to direct unruly Beastmen into a planned attack. Those details explain his identity as an ambush commander: the warherd has a leader able to turn its violence toward a chosen target.
Boris Todbringer and the lost eye
Boris Todbringer, the ruler of Middenheim, wounded Khazrak and took one of his eyes. Their feud gives the Beastlord a personal enemy among the human rulers whose lands his warherd threatens.
The original WH1 Call of the Beastmen pack uses this rivalry as the premise of An Eye For An Eye. It places Khazrak in a separate story campaign against mankind, with Todbringer as his nemesis.
Khazrak in Immortal Empires
In Immortal Empires, Khazrak leads the Warherd of the One-Eye. His campaign brings that identity into the shared world, using Beastmen hordes, Herdstones and Blood-grounds. The Drakwald is his biographical home; the sandbox gives the player control over where the warherd goes next.
The eye, the Runefang, and the older map
The original Beastmen account is more specific than a scar. Khazrak is the paragon of Beastlords. The intelligence behind the remaining eye is the patience and strategic shrewdness of an accomplished general. He wages a guerrilla war: strike where the enemy is weak, then melt away. The only lord of men who bested him is Boris Todbringer of Middenheim, who took the eye with a slash of his Runefang.
The skill portrait adds the scale of the raids. Towns he destroys return to forest. Roads that led to settlements end in undergrowth. The line about the Emperor's cartographers is a measure of that destruction, not a census. On that older grand campaign he begins in the Tobaro region of Estalia, while Malagor begins in the Marshes of Madness. Those starts belong to the Call of the Beastmen map. His Immortal Empires warherd is the One-Eye on the shared sandbox, with Herdstones, and the Drakwald feud remains the biography rather than a scripted final battle against Todbringer.
Khazrak the One-Eye: gameplay and availability · More character stories
Sources
- Immortal Empires DLC Ownership Guide — SEGA — support.sega.com
- Call of the Beastmen — Creative Assembly / SEGA — store.steampowered.com
- The Beastmen — Total War Wiki — wiki.totalwar.com
- Beastmen Legendary Lord skill posters — Total War Wiki — wiki.totalwar.com