http://web.archive.org/web/200401221...Id=1505&Page=1
Name: Invisibility to Undead
Level: 39
Mana: 100
Class: Divination
Era: Scars Of Velious
Resist Check Unresistable
Spell Type Beneficial
Location Use Any
Range 100
NPC Dropped:
Plane of Growth
Wakening Lands
Type: Self Only Buff
Zodmare
FOUND IT
Posted: Sunday, January 28, 2001
I found this spell on a mob in Skyshrine.
Many more posts about finding it in Skyshrine
Also reports of finding it in Cobalt Scar, Wakening lands, etc. Refer to the link to read the discussion
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Keep in mind this is a Wizard only specific spell, not to be confused with the other IVU spell currently in game