The Red exorcist - Blue exorcist x male oc

The impure king!

Kenji is running up the hill and eventually sees the giant impure king

Draco: Hey Kenji this way it's Bon's dad

Kenji: huh really

He runs in that directions

Kenji: Mr suguro

The old man doesn't say anything he's just breathing heavily

That's when he hears the exwires

Bon: Dad!

Izumo: Kenji!

Kenji: Hey guys I just found him he's in really bad shape

Bon: dad I'm here

Konekomaru: I'm going to call mrs kirigakure and let her know we found him

Kenji nods: good idea

That's when a small thing of fire emerges from Tatsuma's chest

It eventually takes the shape of a humanoid bird,

?: I go by names karura and I serve the high priest of myodarani

Bon: Karura are you dads familiar

Karura: I was but my pact was broken with him after my secret was revealed currently I am bound to tatsuma suguro by a different pact

The old man wakes up

Tatsuma: ow that hurts

Bon: dad

Tatsuma: Ryugi what are you doing here

Bon: I cam to get you

Tatsuma: well that was dumb

Karura: I have healed your wounds tatsuma but you must not move yet

Tatsuma: karura I've never seen you so tiny I can't believe we are both alive after that

Karura: yes well I am also known as the phoenix I will always be reborn as for you I will not let you die our pact for the holy fire is still in affect

Tatsuma: rin you're here does that mean you read my letter

Bon: I read it too dad

Tatsuma: what?

Kenji: I heard it too we all understand the situation

Bon: he's right so tell us everything now!

Tatsuma: alright son I'll tell you how to kill the impure king

He goes onto say the impure king will grow as big as a castle and then A sporangium will sprout in the middle of it

Renzo: sporangium is that it the curly cue thing in the middle of it

Tatsuma: yeah I guess that's it and when it's matures it's going to pop and let loose a thick cloud of toxic spores then the miasma will spread all over last time this happened 150 years ago 40,000 people died and if it gets loose again in modern day Kyoto even more people are going to die we've gotta stop it no matter what

Bon: then if we kill that thing before it's spore sack pops that should do it right

Tatsuma: that's the idea but it won't be easy the impure king's only weak spot is it's heart and that's inside the sporangium legend said when fukaku did it, it took all he had just to get to the heart he chopped it in half and sealed the pieces away and stop it

Izumo: then the right and left eyes are

Kenji: the two halves of its heart

Konekomaru: in order for us to get to its heart we'll have to open up the sporangium first