The spirit of light appeared before the man and said if you seek my power I will give it to you on one condition. The man said I don't care about the condition I accept as long as you give me the power to kill this bastard.The light spirit looked towards the beast and exclaimed"uhh it can't be " th spirit turned to Amon and said very well I will give you my power but there is something you need to know about that so called beast.
That beast is human.Amon was shocked and asks the spirit what do you it's human.The spirit said you see it's both human and spirit,when an elemental spirit is summoned by a human the human power increases each time they use their spirit energy and eventually the human and spirit energy finally reach a point where there two energies can combine.We the spirits call this process spirit assimilation:spirit dye.
The humans mana energy becomes one with the spirit mana which is much more stronger and powerful than the humans so assimilation let's both the spirit and human energies combine thus creating a more powerful human and spirit who is yet to be born.Ok so what do we have to do to beat this bastard.Simple and not as simple we also have to merge.Fine with me but how do we even do that.The light spirit said first you have to give me a name.What! naming you will give me the power to put this bastard in the ground.Not quite the assimilation requires you to call out my name given to me by my master.
OK then choose to name you kira.Very well than from now on I shall be know as the light spirit Kira and you Amon as my master,Ok let's do this.Now repeat after me,Kira spirit of light that that destroys the darkness,spirit assimilation:spirit dye.