That's a BOSS with half a million blood. When it sits still, it's called Zhenggang Black Wheel, and it won't take the initiative to attack. As long as you don't touch it, it won't lose blood ... When you hit it at a certain time, it will stand up and take the initiative to attack. This time it's called Black Wheel King. You can impress him after three turns. But it's laborious. And it's thankless. There's no need to fight.