In Mortal Kombat 9 (2011 version) for the PS3 and Xbox 360, each character has multiple fatalities that they can perform at the end of the match once their opponent is defeated.
This is the list of all finishers (fatalities, babality, and stage fatality) for Ermac.
All of these moves can be unlocked and added to your moves list by performing them in either Arcade Mode or Versus Mode.
Looking for more finishing moves? Check out my complete fatality guides:
Fatalities and babalities for Mortal Kombat on PS3
Fatalities and babalities for Mortal Kombat on Xbox 360
Ermac’s Fatalities & Finishing Moves
Xbox 360
Mind Over Splatter — Down, Up, Down, Down, RT in jumping distance
Pest Control — Forward, Back, Forward, Down, B in jumping distance
Babality — Down, Down, Back, Down, Y in jumping distance
Stage Fatality — Down, Up, Down, Down, A at close range
PS3
Mind Over Splatter — Down, Up, Down, Down, R2 in jumping distance
Pest Control — Forward, Back, Forward, Down, Circle in jumping distance
Babality — Down, Down, Back, Down, Triangle in jumping distance
Stage Fatality — Down, Up, Down, Down, X at close range