You sear undead foes, push them back, and root them in place.

Encounter   ✦     Channel Divinity, Divine, Implement, Radiant
Standard Action      Close burst 2 (3 at 11th level, 5 at 21st level)

Target: Each undead creature in the burst

Attack: Wisdom vs. Will

Hit: 1d10 + Wisdom modifier radiant damage, and you push the target a number of squares up to 3 + your Charisma modifier. The target is immobilized until the end of your next turn.
    Level 11: 2d10 + Wisdom modifier radiant damage.
    Level 21: 3d10 + Wisdom modifier radiant damage.

Miss: Half damage.

Special: You can use only one channel divinity power per encounter.

Update (4/21/2011)
Updated to match Class Compendium.

Published in Player's Handbook, page(s) 62, Class Compendium.