Azhag the Slaughterer

Azhag was a middling warboss on a losing streak when he crawled, half-dead, into a tomb in the frozen wastes far north of Kislev and came out wearing his doom. The Crown of Sorcery is ancient, iron, and inhabited: within it lingers an echo of Nagash, the Great Necromancer, and from the moment it settled onto Azhag's skull, it began to whisper.

The whispers made him terrible. Azhag descended on the Empire's northern provinces with strategies no orc should be able to conceive (feints, encirclements, sieges conducted with cold, deathly patience), while green fire and fouler magics crackled from his fists. Astride his wyvern Skullmuncha he broke armies that had never before lost to greenskins, and the scar he burned across the north is remembered wherever Ostland and Ostermark bury their dead.

But two tyrants share one skull, and neither will kneel. The crown despises its wearer's stupidity; Azhag despises the crown's scheming, and suspects, correctly, that it means to hollow him out and wear him like a glove. He keeps it anyway. That is the pure orc of it: Azhag knows exactly what the whispering iron is doing to him, and has decided it is worth it for the winning.