Thirteen Bled Promises death of an alien

Driving compulsion to find a constraint.
In my psyche the range is expanding.
I can put the blade through his neck, but his mind won't stop vocalizing.
Iron translucent reflects a new moon.
Outraged, he's no longer staring.
His density starts tenderizing.
Their immortality is proved wrong.
I see he feels the pain.
Calmly, he awaits a conclusion.
He feels pity for me, for they can see the future.
(Siente pena por mi. Puede ver el futuro)