Monster Within

Got this from a dream I had

Darkness lurks within
Squirming and screaming to be free
What lies before me
Is not me, but it is
His tongue so sharp
The beast's mask a ferocious snarl
What drives this creature?
Anger, Pain, ... Insanity?
The pushing sadness and anger
Creating a tidal wave
Which thrives in the beast
To be the demise of his enemies
His enemies to only be his family
When chaos has ended
And all seems to have mended
The beast remains
What will awaken him again
What will awaken me next?