Like a man lost in a desert for days, finally seeing an Oasis, Godslayer drank the Darkness from the deathly toxin, taking it all into his incorporeal body within Alex's Spiritual sense.
"Take your book out. I need the Death aura too," Godslayer said and focused on what he was doing at the moment. Alex did as asked, bringing out the Blood God's Manual in front of him, which contained within it a massive amount of Death aura.
Godslayer needed both Death and Darkness aura at once to improve his strength permanently, so his dark tendrils reached onto the book as well, sucking away the Death aura within it.
Alex kept teleporting and attacking, but since his focus was entirely on stopping the man's skull from killing him, he couldn't attack back much at all.
The man kept swinging his chains around, knowing that one of these times he would get Alex.