Holy Champion

Holy Champion is an unimplemented priest spell that was added to the database in. It resembles the earlier unused spell Proclaim Champion, though unlike Proclaim Champion, it wouldn't have enabled any additional champion spells.

Speculation
This spell is in the same ID range as several spells that are used by Severed Essences (mirror images of players) in Icecrown Citadel, but weren't available to players when Icecrown Citadel released. These Severed Essence spells were thought to be related to, and some of them—such as Heroic Leap—were indeed added with the expansion. Thus, Holy Champion might also have been intended to become available in Cataclysm.