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The Ryu and Ko do that or just the Ko (I'm actually going to read HxH again tomorrowit comes from Ko. basically, everyone has 10 aura nodes in their body that produce aura. when punching normally, you don't use those aura nodes so you're just punching with your muscles. when you enhance your fist with your Nen, you attack with one aura node. but with Ko, you can put the energy of all 10 aura nodes into your fist to hit 10x harder than you normally would.