A colossal 4v4

After the previous chaos in monta city, in the middle of nowhere Zay, sai, wrath and kitabou are still fighting off these new zufu creatures!, later in the fight yang helps sai shoot out a devastating dangerous beam that can vaporize strong zufu spirits/creatures meanwhile Zay finally knows one of the zufu spirits name!, mokujin, having the head of a tree branch but despite all that completely powerful yet terrifying! Zay and mokujin clash brutally tanking and landing blow on their bodies,after that.. Zay gives out a speech introducing himself to what he's becoming now to reality! Later on defeating him in the process, but unfortunately mokujin gets his life taken by an anonymous figure in a mask.. Who could that be?..