I'm dying but the dead can not be killed

Si deus me relinquit,
Ego deum relinquo.

Solus oppressus nigram clavem habere potest,
Omnias ianuas praecludo
Sic omnias precationes obsigno.

Sed
qui me defendet?
me terribilissimo ipse. 

Перевод:
If God has forsaken me,
Then I shall forsake God, too.

Only the oppressed may possess a black key,
I close all doors
Thus I seal away all prayers.

However
who protects me?
From the most frightful: myself