Firstly, this riddle is a significant one! The answer is innocence. Innocence, that one simpleton which once used to flare in our bodies. However, 'death' came in the middle of our lives, daunting our innocence and possessing its powers over it. Thereby, I consider 'innocent or innocent' to be a very valid answer to this riddle.
Ps- I accord importance to this question and hope my answer is marked as the brainiest answer. Also, this question is nowhere interlinked to Maths :P.