Execution: Levitation, Your character levitates your victim and uses the lancer to rip them to shreds.

As for the skins there are 5 sets.

Carnage Skins

Lancer: get 10,000 elims

Gnasher: get 45,000 elims

Snub: get 2,500 elims

Boltok: get 4,000 elims

Talon: get 1,500 elims

Longshot: get 8,000 elims

Markza: get 6,500 elims

Claw: get 2,750 elims

Overkill: get 1,650 elims

Enforcer: get 7,000 elims

Breaker: get 9,000 elims

EMBAR: get 8,500 elims

Hammerburst: get 20,000 elims

Retro Lancer: get 15,000 elims

Dropshot: get 25,000 elims

Boomshot: get 25,500 elims

Lancer GL: get 30,000 elims

Torque Bow: get 1,750 elims