Would True Seeing allow a caster to determine the true identity of someone who has undergone a Mind Switch?
There is disagreement at my table over the scope and meaning of this phrase:
sees the true form of polymorphed, changed, or transmuted things
My opinion is that no, True Seeing would not reveal that a person is under Mind Switch. Thoughts?
True Seeing however, would definitely reveal the magic of the spell though.
I disagree. True Seeing is not Arcane Sight, and nothing in the spell description says that it lets you see magical auras.
True seeing sees through magic, showing you the world as it would be without magic. It doesn't actually show you the magic itself.
As for Mind Switch, I would say True Seeing doesn't show anything. I could see the argument either way, though.