Come and stir the waters

Your soul can dance around me anytime I call your name.
To you, you are unique, but no, to me you're all the same.
I'll steal your light and make you fight with me to give it back.
I'll laugh and kneel, forever steal the courage that you lack.

I keep these souls well hidden in a place that never sleeps.
Once I have possessed it, you know it is mine for keeps.
There is no amount of begging which will bend me to your will.
I am the sole survivor of the thing you tried to kill.