[@Raineh Daze]

At his most sophisticated, Magnus has survived attacks that have annihilated planets, although that is with his defences augmented by the full force of his power. He hardly ever appears in the Materium, and when he does, almost no force the Imperium can deploy is able to take him on. The entire Space Wolves chapter would be unable to defeat him if they mobilized together. The dude is the most powerful Primarch by far, and arguably the most powerful currently active entity other than the Gods in the 40k mythos.

Angron's manifestations do require the effective force of billions of nukes to actually take him out. Take into account that even standard missiles used in ship combat far outclass modern nuclear weaponry, and can easily level countries. And that characters such as Angron have survived being hit by such attacks.

The explosion created by Excalibur is a pebble in a pond compared to a high-powered nuclear weapon, which would have simply leveled the entire city had it been unleashed.

Personally, I was opposed to accepting Magnus, considering his immense power. But this is partially balanced by the fact that he has no real skill in melee, and therefore cannot bring most of his physical prowess to bear properly. His magic is also limited, preventing him from doing stuff like pulling planets into the Warp, stopping time, or just ripping apart his opponents on a subatomic level.

And I am a huge fan of Fate/Zero, which I've watched 3 times now. That clip is awesome XD. Damn. Although Rider is still the best character.