Angelic Alacrity is a 1st level avenger Encounter power that was introduced in the Player's Handbook 2.
Angelic Alacrity
Avenger Attack 1
You focus divine energy through your body to gain uncanny speed as you make your attack.
Melee Weapon
Target: One Creature
Attack: Wisdom Vs. AC
Hit: 2[W] + Wisdom modifier damage
Effect: Before the attack, you shift 2 squares
Censure of Pursuit: The number of squares you shift equals 1 + your Dexterity modifier.