The most useful monster is the Dragon King, and that's it. Neither a Djinn nor a Black Dragon can compare to him in terms of power. It's simply a fact. Well, maybe the "Creators" have created someone stronger than the Dragon King. At least, I haven't seen anyone. If anyone knows, please tell me, I would be very grateful.
In general, I strongly disagree that he is useful (when taking him into an army).
