Self powered & Blood-line Impulse
Unknown=Impulse + Eaten= Self powered Impulse + kids= Blood-line Impulse
Where Impulses came from is unknown to the world at least for now after a human eats an impluse that person's DNA starts to break down and change completely. After it's rebuilt the person who ate the impulse start to develop special powers only they can use and control instead of staying in that person's body after having or getting kids it is pass down on to them not only them but it can by pass down from generation to generation of that person's family which is what we call Blood-line Impulse.
Cryptid Impulse
Unknown=Impulse + Yoaki's death + 100 years after = Cryptid Impulse + Eaten= Paragon
Cryptid Impulse is harder to explain after a yokai's is kill it's power and soul will be transfer into a Impulse after 100 years of their death. if found by a human and eaten it will give the human special powers and they will be their vessel but eaten by a yokai then the pervious yokai would be reborn taking the yokai's body and powers if they have any.