Originally posted by NotAllThatEvil
Does superman even know what kryptonite is? As far as he know its just a magic spear batman made.
Magneto only knew that his helmet was a helmet Shaw wore. And he maybe knew it was created by the Russians. He didn't know the design, just what it did(block telepathy) and Apocalypse made a perfect replica.
Why couldn't he read Clark's mind and say hmmm, green space mineral that hurts him a lot? Done. And then he telekinetically shoves it in his mouth.
He's still shown to be able to manipulate matter to create something from the thoughts of a person.
If he can make something as advanced as a psi-blocker helmet, right down to the design, dimensions, and color. He should be able to make a space rock. There's 100% more evidence he can do it than he can't.