Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)

Overtyrant's Crown
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Talisman

Specially created by the finest artisans of the Empire for a king's ransom in gold, this enchanted basin-sized crown is encrusted with gems and nailed directly into Greasus's lumpy skull. It enhances his intellect to near-human levels, and is the closest to a symbol of royalty the Ogre kingdoms can muster.