The first one

I killed was by mistake

The second

Infected by the snake

Delusion

Set in after the third

I'm losing track

My heart is black

My blood is cold my skin is pale

My heart is black

Now follow me on my black trail

My heart is black

My eyes are wide my hands are nailed

My heart is black

I'm leaving now

The plan has failed

Follow me I know the way

I'm only

A shadow of myself

I'm lonely

What have I become

I'm falling

Back down the steps I climbed

I'm going back

My heart is black

My blood is cold my skin is pale

My heart is black

Now follow me on my black trail

My heart is black

My eyes are wide my hands are nailed

My heart is black

I'm leaving now

The plan has failed

Follow me I know the way

If you don't a fight with me

Leave silently

But never turn your back on me