[@Raineh Daze]

Actually, there are other weapons on the same level of Excalibur that would be able to harm him. And he wouldn't no-sell it, he'd simply take a relatively small amount of damage. You'd need to hit him repeatedly to kill him. This is also because Excalibur is magical, and Magnus has an inherent resistance to all things magical, due to his nature. And he only requires the power of the Warp to survive planet-destroying attacks, nukes are survivable either way.

But yes, Magnus is terrifyingly powerful. Most characters would have a hard time inflicting any real harm. This is one of the reasons I was opposed to bringing him in. However, as I said, I think Gil could defeat him, considering Magnus lacks the combat skills to be a significant threat in melee, and Gil is mostly immune to direct magical attacks.

I would argue that you're thinking of the wrong type of nuke. We've long since surpassed the little things that were dropped on Hiroshima, creating weapons over a thousand times more powerful.

Considering Magnus is composed of the Warp-stuff of Tzeentch, the literally body and soul of a Chaos God, I have no doubt Enkidu would work on him. That would be one of the ways Gilgamesh could win this fight, as in his current state Magnus would be unable to escape from Enkidu if he is trapped within.