Hmmm. That one took some looking. Spiteful Glamor is a Warlock power that Aimhirghin obtained courtesy of the Bard's ability to take multiclass powers from any number of different classes. I got the specifics from the Character Generator, and assumed that since it's a Warlock power it was in the PH.
However, a search of the Warlock class in that tome proved fruitless, as did a quick glance at the PH2. I finally resorted to the D&D Insider and used the Compendium - you can find the details of Spiteful Glamor there via a search, along with a reference that indicates the write up can be found in the Forgotten Realms Player's Guide (which I don't have).
Here's what I have on it:
[sblock=Spiteful Glamor]The mere sight of you is anathema to your enemy.
At-Will Arcane, Implement, Psychic
Standard Action Ranged 10
Target: One creature
Attack: Charisma vs. Will
Hit: 1d8 + Charisma modifier psychic damage, or 1d12 + Charisma modifier psychic damage to a target at maximum hit points.
Increase damage to 2d8 + Charisma modifier at 21st level, or 2d12 + Charisma modifier to a target at maximum hit poitns.
First published in Forgotten Realms Player's Guide.[/sblock]
The only change to the above write up for Aimhirghin is that for him it is an Encounter Power rather than At-Will.