A lot of them are damaged, but some work. They let you go out into space for a little while. Like for Mystique's project putting the clocks on the hull to track how long the jumps are, they wore the spacesuits for that.
It's like a dementor or a poltergeist [ muggles have those right? ] but created from fear instead of despair or chaos. It takes the form of something you're afraid of. For me it's a full moon. Etc. They're not violent or anything. Unless that's what you're afraid of, I suppose.
I found it in my locker a while ago. I think it was one of my dad's. He's sort of an expert. They are corporeal. I've never heard of one killing anyone, though. If you're dead you're not afraid.
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