The Son of Yami

Devil Union

it has been brought to my attention that giving asta 6 different magic abilities wasn't the best idea , so it's time to nerf / balance him out a bit

fire magic - using too much of it will overheat his body and well run out of stamina if he uses fire magic while at his limit of overheating, note that it will aslo cause physical harm

ice magic - using too much will give asta frostbite and cause him to get slower & began to lose stamina , think of his fire and ice abilities like todorokis from mha, where he has to either balance them out or not use too much

lightning magic - i think his lighting magic is fine as it is right now

spatial magic - now this is a big one, i'm only gonna let asta use this magic to the extent of a two millie radius , so he can't go from the heart kingdom to the clover kingdom in an instant , he'll have to fly there
i'll aslo note that the longer distances he uses them the more mana it will drain

i'm not going to have the rule of "i've been there, i can go there" thing like finral

now that's out of the way let's continue

nacht opens the door to the black bull base after another mission in the spade kingdom to find everyone minding their own buissness, he walks to asta room and knocks

"COME IN" nacht walks into the room to see asta at his desk writing a letter and sending money to hage village

"hey boy, i heard you got a new form" nacht says with a smile

"yeah i call it devil union!, well my devil named it that but it's an amazing ability, and since you're here i wanted to see if you can help me train it." asta asks nacht as he agrees and takes him outside

"okay asta, show me your form again" nacht says as asta begans to let the mana take over him

he pushes himself easily into his half demon form, then it takes more to go into his bezerk form and he finally hands into his devil union form

"this- this is hard to maintain" asta struggles to say

"don't worry, just relax and let the mana flow through your body"

asta settle down and he begans to breathe steadily and looks up at nacht

"come at me" he says whike going into his own devil union

devil union - canis

nacht is surrounded by a black cape and he gets sharp flows while growing out his horns

"okay here i come!" asta says rushing nacht with a huge hit to his body as he fly's back and lands , nacht returns with his own slash and cuts some of astas mana off of him but it quickly returns

"amazing! this is the power of devil union" asta says as he feels faster, stronger and smoother in this form , but he can feel his mana not being able to keep up

fire magic - flame emperor

asta creates a ball of fire with the tip of his index finger and throws it at nacht , nacht has to counter with his own attack

SHADOW MAGIC - THE BLADE OF SATAN

he creates a blade that slashed the fireball in half as asta instantly goes in and kicks nacht down into the ground with a thud