Burn it down.

The driller killer drives to town, enters a movie theater and murders whole bunch of people. The driller killer then returns home where he starts having hallucinations, such as a corpse from the night before repeating his name and telling him that he will burn in hell, whole room burning, and large set of chattering teeth blocking the stairs. The driller killer  goes to bed and has a dream where he is in the mortuary killing naked people and running down the endless corridors. The driller killer wakes up and is approached by the strange voice who tells him that it must tell him something, but first he must return to his old school and burn it to the ground.

The driller killer returns to his old catholic school with a flamethrower and starts killing everyone and burning the whole place down. He encounters the Nun in a wheelchair (the same nun who told him he could not attend the party) who insults him and tells him that he will burn in hell for all of this, and the driller killer kills her before leaving the school. The driller killer returns home where he is ambushed by the police. The strange voice apologizes to him and tells him that it had to cooperate with the FBI because it didn't want to go to jail. The text below is displayed afterwards:

The driller killer was convicted of 36 counts of first-degree murder."

5 years later in a mental hospital, the driller killer hides in a closet while everyone prepares to go to bed. When the nurse comes looking for him, the driller killer emerges from the closet, kills her and then starts slaughtering everyone. After killing everyone in the building, the driller killer finally  reaches the exit and escapes the hospital.