I am

When there is darkness

I am what blinds you
I am what poisons you
I am what betrays you
I am what hurts you
I am thy enemy

When there is light

I am what calms you
I am what elevates you
I am what creates you
I am what shapes you
I am thy friend

When all is lost,
I am...

nothing

Just a little something I came up with just now.