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Kemmerich literally symbolized death. Death is personified as draining Kemmerick's life away. As Kemmerick dies we can see death creep over his body, almost like a posession, "Death is working itself from within. It already has command in the eyes....." Death becomes a thing unto itself sucking the life out of Kemmerick's body.
It may symbolise death, marcus' maths mark did induce a darker mood throughout the starting chapters