Regroup AKA Tactical Repositioning - Warlord Level 1
At your command, your allies move into position, forcing with timing and coordination, their opponents to back off and regroup.
At-Will ♦ Martial, Fear
Standard Action - Close Blast 5 Target: Each Enemy in blast
Effect: Each ally in the blast can shift 1, either before or after you resolve the attack.
Attack: Intelligence vs. Will
Hit: Psychic damage equal to your CHA mod, and you push the target 2 squares. Level 21: 3+CHA mod damage
The above was inspired by Beguilling Strands, however bringing your allies in to the picture gives it more warlord flavor.