@AbdulAlhazred might increase level and damage ;p but this is patterned after a Bards banishment style spell from 4e. LOL
Pugilists Legendary Uppercut/Smash - Warlord Attack 5
With the might of legends you smash an enemy out of the field of battle
Daily ✦ Martial, Weapon
Standard Action Ranged 5
Target: One creature
Attack: Strength vs. AC
Requirement: One hand free.
Hit: 2[W]+ Str modifier damage.
Effect: push target 16 Squares (target makes a series of saves) increase distance by 16 per failed save;
Special: May be used as a basic attack at the end of a charge
Alternatively: this can be done as a smash which pushes the enemy out of play (save ends) represents them digging there way out visualize distance underground as significantly less.
Really hard ground option: adds a daze results and a bit more damage.