https://web.archive.org/web/20020621...ns.asp?Id=1476
Re linking the link you provided:
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		| SOME INCORRECT INFO POSTED HERE, By Bowynn bel'aurora (7/5/2001) 
 This is not a quest spell, it's a drop, and it doesn't provide any Invis vs. Undead.
 Got mine in Velketor's off Kobolds.
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		| NOT BOTH INVISES, By Dalcharis crystalbreeze (7/1/2001) 
 Running around in Karnor with this on, the undead still see you so I don't think it's invis to undead as well as regular invis.
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		| NOT INVIS VS UNDEAD, By Morudoth nimgaur (6/21/2001) 
 Just to make sure no one takes the earlier commenter seriously ...
 This spell does NOT work vs undead. It's a fixed-duration normal invis, nothing more. I've had newbie skeletons in Field of Bone see through this spell and smack me as I ran past.
 
 And there's no quest to get this spell in Velious that I know of. It's a Velious spell drop.
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		| REGULAR INVIS/INVIS TO UNDEAD, By Cassia (6/3/2001) 
 You are still visible to Undead when you have this spell on.
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 So no, this should not be double invis.  Just fixed duration invis.