Mark of the Champion (Caster)
From WoWWiki
Mark of the Champion is an epic trinket. It is a quest reward from 
[60] The Fall of Kel'Thuzad, obtainable by killing Kel'Thuzad in Naxxramas, and bringing [The Phylactery of Kel'Thuzad] to Light's Hope Chapel. The item is available for both physical damage dealers and spellcasters. It is still useful in The Burning Crusade, as it includes a bonus for damage dealt to demons.
This is the caster version, the physical version can be found at [Mark of the Champion].
