I can't believe all humans are gone, this pretty much means Arisa's elf tribe is wiped out. Erika and Rowmen's country, the princess and Rowen's family. If those 7 people are having so much trouble against the shades, I seriously can't imagine them standing a chance against Nexus. 1 Giant Nexus was soloing Isabel + Luna + Rowen(human form). Nexus probably = a bunch of those huge Shades together. I guess it will be a duel between Urias and Nexus then.
I didn't find the right solution from the Internet.