Speaking of the Crown of Sorcery, I do wonder how it found its way to Troll Country where Azhag found it. Looking at the list of those who wore it, after Sigmar defeated Nagash, the only person (recorded in canon) who wore it since was Azhag, who found the Crown in the labrynths of the ancient city of Todtheim in Troll Country while he was hiding out from Chaos Warriors. He found the Crown in the posession of a Chaos Troll (part of the Troll's den, not worn on the Troll's head). He then wore it, and he did this around the mid-2510s IC. He's actually a very modern character.
The question, then, is what the hell happened to the Crown between Sigmar and Azhag. Somewhere in those 2500 years the Crown found its way northwards, which the Crown wouldn't appreciate. After all, it has a will of its own and it wants to go back south to Nagashizzar.