In this chapter, we learn that the "Essential of Demon Slayer" is to "gather all your strength" on one point. In other words, it's to "put all your energy" on your fist, so you can do whatever you want with it. This is the first time we've heard this phrase before, so we're not sure what to make of it. It's a bit of a mouthful, but the gist of it is that you need to put all of your energy on a single point to be able to do anything with it, whether you want to do it with your fists or with your feet or whatever. We're pretty sure that's what you're going to do with this one. We also learn that you don't need to have a fixed body to do this. You just need to be in the "most high-dimensional form" . That's right, you need a "fixed physical body" , not just a "high-dimensional" body . You know, the one that you've seen in the movies . This one's just a little bit different, though, because it has a physical body, not an "infinite" body. You see, the "Infinite" body doesn't exist in the same way as the "Ageless" body, so it can't have the same core. So, you'd better kill him with one move, because he's not going to kill you with his physical body. He's got a "higher - dimensional" body and he can do anything he wants with his fists. He can even heal his body in a second, which is why he calls him "not his rival." This guy, he says, has been hiding out to wait for the opportunity to kill him.