4

There are 3 people in this world.
Theorized to be 4.
Their brains are spilt into 22.5 parts, all working for something different.
Powers, you could say.
A normal human being has a brain that has 16 parts.
These people have 3 jobs.

Find the fourth.

Exercise demons.

Rid the world of Lucifer.

Once
And
For
All....

... Even if it does include the death of innocent mortals ...