Just looking at it with his mage sight made the wizard squirm. That was not something he wanted to be killed with. Death would be the least of his worries then.

“All weapons are dangerous, but I am a follower of Khorne,” said Grume with a grin of contempt. He was every inch the great warlord, talking down to his wizardry minions.
Idiot! Kelmain thought. Why did they always have to work with these muscle-headed buffoons? He sometimes suspected that the Great Powers of Chaos chose their warrior champions for their stupidity — particularly the Blood God.
Indeed he is, murmured Lhoigor’s voice within his head, and Kelmain knew his twin was thinking exactly the same as he was.
“I do not like working with you followers of the Changer of Ways, any more than you like working with me,” said Grume, “but the Great Ones have spoken and daemons have brought me their words. The time has come for us to unite and overthrow the weak kingdoms of men.”
Indeed it has, thought Kelmain. And I wonder if you realise how much the place in which we stand has to do with this. He glanced around at the remains of the ancient arch that dominated the chamber. Here was spellwork of great cunning, godlike in its complexity, so intricate that even when dormant it threatened to overwhelm his mind. The Paths of the Old Ones, Kelmain marvelled. We have opened them, or rather our masters have, and we may use them as we will. Soon, he thought, they will put this entire ancient and corrupt world within our grasp, and we will reshape it to fit our dreams. But to do this we must work with idiots who want to use us only for their own stupid purposes.
Grume opened his visor to reveal his bloated and ugly features. A glint of feral cunning showed in the warlord’s small pig-like eyes. Kelmain could almost read his thoughts. The Axe of Gotrek had become a legend among the followers of Chaos. At the Siege of Praag, it had breached the supposedly invincible armour of the great Chaos Warlord Arek Daemonclaw. The death of that mighty champion had led to the breaking of his army and the siege of the City of Heroes. Rumour whispered that the dwarf had even destroyed the physical form of one of the Great Daemons of Khorne in the lost city of Karag Dum.
Kelmain was one of the few in a position to know exactly how true those rumours were. Grume already had several powerful weapons forged with the imprisoned souls of mighty daemons and champions. It was obvious that he wanted to add the dwarf’s axe to his collection. It was equally obvious that when the time came, after the forces of Chaos were triumphant, he fully intended to use the weapon against those who opposed him.
It was a plan admirably suited to one of his utter stupidity, but who prided himself on his cunning. It would hardly do, thought Kelmain, to explain to him the full perils of trying to use that axe. There, indeed, was a weapon that would take enormous power to pervert to the ways of Chaos, and a tremendous understanding of magic. Grume had absolutely no knowledge of such things. Kelmain did, although he was loath to risk using his powers in so dangerous a pursuit at so critical a time. They were needed to oversee the use of the Old Ones’ devices and ensure that they served Chaos well. Still, perhaps Grume’s ambition could be put to another use? He glanced into the crystal once more to see if his brother was following his thoughts. Lhoigor’s answering smile showed that he was.
“Do you know what happened to the last wizard who mocked me?” Grume asked, his voice full of menace. He had the confidence of one who knows he has a small army of beastmen close at hand.