Originally Posted by
Eddren
Alterations are, yes, quite permanent. He's essentially altering the way magic is routed through the spell, so as long as there's magic flowing through it, it'll work.
Think of it less like him putting new effects over the old ones, and more like him cutting wires and reattaching them elsewhere. It's sort of a piece of precision work. So a could a dispel magic-esque spell remove it? Well, technically, no, it couldn't remove the alterations. But a spell that allows someone else to undo alterations, or a spell that has the effect of bringing things back to their original state might well do the trick.
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