The other way to create new, more powerful Yo-kai is to visit Mr. Zen at the Shoten Temple. There, he can either fuse two Yo-kai or fuse a Yo-kai with an item. Once you’ve finished combining items or Yo-kai, the recipe is recorded. This new Yo-kai immediately becomes your friend!
Fusing Two Yo-kai
A number of new Yo-kai can be created by fusing two “source” Yo-kai. If you decide to fuse two source Yo-kai, the resulting entity combines the traits of its progenitors. (Note that one Yo-kai created by this process, Castelius I, is formed by combining two copies of the same source Yo-kai, Castelius II.)