Okay then. Well, Gon, before he starts fighting a certain Chimera Ant does something similar to Krupika's Nen Blade. After he does this he is surrounded in a dark aura and goes absolutely beast on the Chimera Ant. And when i say beast, i mean BEAST!! He turns super muscular, his hair gets longer, basically imagine a dark Super Sayian with their hair blowing wildly in the wind.