Warlock Attack 23Dark Transport
You forge a short-lived dimensional gate that slices through your opponent. If you wish, you can leap through the gate and take his place while banishing him to the spot you were just in.
Encounter Arcane, Implement, Teleportation
Standard Action Ranged 10
Target: One creature
Attack: Charisma vs. Will
Hit: 4d10 + Charisma modifier damage, and you can swap places with the target.
Star Pact: After swapping places with the target, you can teleport a number of squares equal to your Intelligence modifier.
Published in Player's Handbook, page(s) 138, Class Compendium.