With your attack, you utter a promise to follow your enemy if it tries to escape.

At-Will   ✦     Divine, Weapon
Standard Action      Melee weapon

Target: One creature

Attack: Wisdom vs. AC

Hit: 1[W] + Wisdom modifier damage. If the target doesn't end its next turn adjacent to you, you can shift a number of squares equal to 1 + your Dexterity modifier as a free action, and you must end that shift closer to the target.
Level 21: 2[W] + Wisdom modifier damage.

Published in Player's Handbook 2, page(s) 35.