What could be hided inside of this door?

Twilight stage of fallen angels, divine horrific show 
Once you enter self surrender won't remember anymore

Let me enter sweet surrender no more worries anymore

Gentlemen upon accepted one price you have to pay 
Your mostly valued body parts 
In your case your precious loving heart

Once accepted and mutated you forget the ones you loved

From the streets of pain, I'll hide away
Forgetting everyone, I have ever loved