User blog comment:IamJakuhoRaikoben/Chapter 440: God Serena, Review./@comment-26389992-20150615123219/@comment-1153699-20150618125945

@Wrath -> The black mist inside the water looks a lot like MBP. Since there were already 2 Demons capable of using MBP, I figured Torafusa could use it as well. Fair enough then.

There's nothing that indicates that the Carbon Natsu and Lucy were exposed to is any less lethal to human Mages than MBP is though. Just saiyan...