Great chapter. Finally after so many years, we discover what Kurapika's index finger's power is. Based on the spoilers I was a little worried it would be too overpowered but after reading, it seems like there's at least two conditions to its use:
-He has to know the user's nen category.
-He can only use the ability once.
In fact, you can also add that he needs to be capable of sucking the opponent's nen for a while (which might not be possible on a user of equal or greater strength than him) and has to be in the state of Emperor time. So all in all the ability seems pretty balanced.
I think at this point, it is undeniable that Kurapika has the most versatile ability in the entire series. Part of it because of his talent, but also because of his determination and last but not the least, his genes (scarlet eyes).
The pacing is really good too, Togashi seems to be wasting no time revealing the various nen beasts of the princes. And the king, as expected is a massive a-hole. He seems to have no concern for his kids.
One interesting concept introduced in this chapter seems to be that of "parasitic type" of nen abilities. I hope it is explained how exactly that jar or whatever it is, has the power to do such a thing.
Well, looking forward to the next chapter :)