User blog comment:B214/High School DxD Hero Discussion/@comment-27083298-20171106223524/@comment-26345952-20171107111247

Actually the color in the LN (as described) was always black. It just that in art style purple is used kind of like a contrast (like Saji's flames in the anime). I did liked the way the Power of Destruction looked in the the previous seasons. If they do give the purple to the PoD then onlybto the Bael family (relatives of Sairaorg at least or the current Great King, maybe even Velenala since we barrly saw of her).