manslayer?

As I pierce the needle through my skin
The drug being only a comfort to my pain
Silence is sensed amid dire screams
A penance slips through the gravest of sins

“What face belongs to darkness that veils
Horrid vices, perjury and more malice
Is it really death’s visage, an image?
Riddled with the innocence of man”

A red cloak of blood descends
From your soft and scrawny neck as i sever
Through skin and tender flesh
I feel naught for your untimely death
But to let you live for just one more breath

My pleasure , their sorrow,my sin
I am death in duty, I am an assassin