User blog comment:Kevo411/Nen Battle Thoughts/@comment-24503264-20140612045150

Feitan's sword cannot pierce Youpi, at least I don't think so. He used Ko to pierce through Zazan and it didn't end well. Youpi is a royal guard, and Zazan is only a captain, it's safe to assume that he is also very sturdy.

This is a little off-topic, but I think the real strength of all chimeras lies in the fact that they are all very sturdy, and that goes to the king too. In terms of power, speed, and intelligence, they aren't invincible, but they are very freaking durable. We see this clearly in the fight between Gon and Pitou. Gon owned Pitou in every single aspect, but still needed to use Rock a lot of times before smahing Pitou's head.