Kill or be killed

I come from beyond the grave, to kill everything,
Mankind will be my slave, to the end of everything.
Spill all your blood, rip out your spine,
Everything will be just fine, for now.
Were dead, but still here to kill,
Death is instore for you all,
Better pray for a chance of survival.
So try, to hide.
I come from beyond the mud, i seek for warm blood,
I search for living flesh, what will happen next?
Kill or be killed