Pursuing Supreme Power
The quest is unlocked after completing the Versus Calamity Ganon challenge.
"Calamity Ganon craves supreme, unstoppable power. It falls upon you to feed this hunger or leave the appetite unanswered."
"After it absorbed Malice from a diamond and some of the mightiest monsters in Hyrule, Calamity Ganon's destructive potential became even stronger..."