Ultra Instinct?

It's been a couple minutes since Reima had jumped into the abyss, and it's been a couple minutes of straight falling... He doesn't know how far beneath the earth hes actually fallen but by the speed and amount of time he'd guess it's almost certainly hit double digits in the amount of miles he's travelled. Obviously, as the name suggest, everything around him is pitch black, no colour anywhere apart from Reima himself... In-fact light is present but there is literally nothing to reflect off of, creating a seemingly endless expanse of nothingness around him. Air resistance gradually stops and Reima isn't really sure if he's still falling or not, that is until he lands on his head, thankfully somehow not instantly crushing his skull, neck and spine... Getting up he realises he can't see the floor, he can feel it but it's completely see through or invisible, hard to tell as everything around him is still pitch black.

A large roar echoes throughout the space as a huge man covered in grey scales that envelop the entire left side of his body, the origin of the scales seems to be from his heart, or Dark Sign as Reima's theory on Humanity overdose suggests. The ex-king of New Londo has long white hair trailing to it's lower back with large white horns sprouting from it's head, it's around 25ft and wields a huge grey sword that looks like it was made from the same scales covering it's user.

Reima starts sprinting towards it, becoming slightly disorientated as the invisible floor makes it difficult to judge the distance between him and his foe. It's only through his Observation Haki that he realises he's in striking distance and leaps out of the way of the Abyssal creatures downward slash. As it recovers from it's unskilled overextended attack Reima rapidly approaches and stabs at the creatures torso... Only to deal minimal damage against the King's thick scales, he scowls and quickly dodges the glowing hand trying to grab him, assuming it to be a stronger version of the Dark Hand.

After avoid another strike he contemplates on the more effective strategy from here on out, the scales are too thick for a regular strike to pierce and the only place not covered in them is the King's face, Reima highly doubts that the colossal creature wouldn't be able to defend itself against such predictable attacks but he's left with no other option apart from testing if his spells work... He'll move on to that if he's unable to access it's head, Reima is incredibly wary at blinking of teleporting of any sort due to the disorientating area they're battling in. The abyss doesn't have any land marks and the floor is completely invisible, blinking around here in the heat of battle is likely to result in him being split in half or losing a body part.

After deciding what he's going to do Reima waits for another strike before dodging and leaping with all his strength towards the kings neck, the creature tries to back away so Reima falls short and land below it's collar bone. He grips the scales that seem to provide a nice hand-hold and throws himself higher, this isn't ignored however as the King tries to grab Reima out of the air with another glowing hand. He manages to avoid this by slashing it but the force of his attack knocks him away, causing him to growl in irritation. Flames manifest in his hand as if reacting to his rising temper and he throws a Chaos Fireball at the humanity infested creature. It hits and coats the scales on it's chest in lava but doesn't seem to do all that much apart from pissing the king off...

Reima's about to conjure a Crystal Soul Spear but is blasted in the back with Dark Magic by another King that apparently materialised behind him... This is bad, he didn't manage to kill the first king quick enough, allowing the second to spawn causing him to be outnumbered. He spits on the floor and watches as his red tinged saliva rapidly disappears downwards as if the floor wasn't there. He doesn't have time to ponder on the complex nature of the abyss as he's forced to dodge a flurry of strikes made from both kings swords... Luckily he'd upgraded his dexterity otherwise he'd be mincemeat by now, figuring he won't last if another king appears to assist the other two he sheaths his Silver sword on his back and retrieves Arcell from his Folded Space... He then attempts to cover it in the Chaos Blade except he channels a small amount of Elder Blood magic into it, he didn't attempt this with his other weapons as they'd probably melt, disintegrate, lose their enchantments or any other weird effect as a result of the unpredictable flames. His weapon is covered in ominous Turquoise flames and Reima thinks he can see the space around his weapon rippling, maybe the abyss is being used to fuel the flames as he can no longer feel the pull of his own mana to keep the enchantment active... He pushes his left hand forward and drops into the familiar Wolf School stance, the two kings glaring at his fiery blade with... Apprehension?