In the movies, it's a worthiness/ pure heart thing. In the comics it's just really heavy. I guess the question is, is magic space metal ferrous enough to be magnetic?
It has always bothered me that he used super strength magnetic fields to manipulate non-magnetic metals. yes, that is the thing in the xmen universe that breaks reality for me, everything else is fine
Does this mean he might also have limited water powers in regions where the ratio of metallic solids in the water is above a certain threshold? Kinda like the "metal in your blood" scene in that one X-Men movie.
Enchantments are a one-off thingy. They don't require the enchanter to stay alive.
Otherwise, buying an enchanted sword from someone would mean, you would have to depend upon that person not getting killed by some random robber, when you are in the middle of battling the dungeon boss.
Your characters walk into a magic shop, but instead of buying magic items the shopkeeper offers to sell them scrolls of ownership. "There are infinite number of these scrolls," he explains, "but they all use a decentralized mechanism to determine ownership!"
"Okay, I'll buy one. Now where's my +1 sword?" The fighter asks.
"The scrolls say that you own it" the shopkeeper unhelpfully reiterates. "And every other scroll will be updated to agree that you own it."
I like this because then you can say that a non-worthy person can wield the hammer, if they're stronger than Odin and can beat the enchantment. Magneto is probably on that level.