OK, so I've wanted to start writing for a while, and i think i finally have an idea. so far i have only the earliest skeleton of a plot, but in the story i want to write, something happens to the main character, so far i think he'll find something that belonged to someone evil or something, he'll use it all the time, and he will slowly start hearing a voice, and become slowly corrupted, until he is completely corrupted and he hears the voice of his good personality trying to stop him, until that voice dies out.
"When you stare into the abyss, the abyss stares back into you"
kind of like this
so my questions are, do you think this would work for a story? and is this too similar to any other fantasy?
and any criticism