Word to describe a sensation of death coming over your entire body?
Solution 1:
The dancing figures of death were beckoning him.
In purple prose:
"He could feel the beat of that apoptotic dance spreading through his fingers and toes, up his arms, his legs, beckoning even the innermost core of his being into paroxysms of sweet, sweet nothingness."
The root word here is apoptosis. It refers to the programmed, or predestined if you will, death of cells.
Solution 2:
"Aura" suggests the way he looks to others, which doesn't fit the context you've given. Something like "foreboding" seems like the right word to me.