I did this instead of practicing for the PSAT I have soon.

I can't be seen, but can be sought,
I can't be taken, but can be lost.
I can heal, leaving souls filled,
I can hurt, and can't killed.
I can bring kingdoms all the way down,
Yet I can't put your enemies into the ground.
I'm used without thought, and made in roars,
Once I am used, I am no longer yours.
I exist upon objects, enclosed within stone,
But I cannot exist all on my own.
My value is nothing beyond human thought,
But when made correctly, I'm all humans want.

What am I?

Love?

No.