Another crazy theory from me, but look at that
(maybe its different int book, i dont have english version)
So, 2 theories- King Gilgamesh is dead, and some powerfull necromancer bring him back to life.
Or- Every living thing on Earth
has an aura. What if king is not from earth? what if he is not human? I think this will be the most interesting thing in next books.
Sorry if answer is in Warlock, in my country it has not be released yet.