Sensor Division reported that the Kekkai power which traps "Bull Mask" is getting weak. It's believed that someone wants to release this beast out. According to former Kage, this beast looks like a bull except it has a pair of solid horns and a tail that drills into any metal! But only the elders know its existence. Does that has anything to do with "The Force Of Yami"?
Bull Mask (Right) and Hokage Yudai (Left)