Short post today, just wrapping up Illusionist spells, which in turn wraps up this section on magic in the DMG.
This is, as I understand it, an incredibly nasty spell. One way to escape it, however, is to go unconscious, "somehow." If I'm ever playing and my PC's buddy is being attacked by one of these, you can bet I'll be knocking my buddy over the head to save him.
I was really interested to see Gary refer the reader to the Cleric, rather than the Magic-User, version of this spell for commentary. Comparing the Cleric and Magic-User versions of this spell, it seems that the Cleric version only can detect the strength of a magic aura while the Magic-User version includes a chance to detect the particular type of magic involved. By giving Illusionists the Cleric version of the spell, Gary is giving them the weaker, less effective version.
Finally, in a note that seems to cover all spells, Gary points out that, "the reverse of any spell must be separately memorized, and that each requires special components." I've never liked the idea of having to choose between "normal" or reversed versions of spells during spell memorization, but I certainly can understand why Gary would rule this way.