Back To The Source [RWBY/Honkai Impact: The 3rd]

Chapter 1- False Myth

The Nuckelavee charged, stopping suddenly as the upper body unleashed one of its arm towards him at a high speed. Otto stepped to the side and backed away before looking at the damage it was capable of.

The tree had been torn from the trunk with just a single attack.

"Extendable arms... How interesting!" He smiled, dodging another series of grapples before deciding to test his damage.

In a second he disappeared, leaving a small radius of dust before becoming invisible in the sight of the Nuckelavee. The demon's upper body turned, looking for any sight of the human before suddenly, the lower body fell to its side and the lower body shrieked in pain.

Otto had punched the lower head on the cheek, strong enough to make it fall but not enough to actually blast away the entire head. He was confident with his strength. After all, this body was created with the capabilities of fending off even Durandal herself.

He backed away once more to avoid a swipe from an arm. The upper part, with just one thin length arm, pushed itself off the ground. The lower head puffed out black smoke and its red eyes brightened whilst the upper screamed again.

"Superstrength and regeneration, but on what level?" Otto brought a hand to his chin, the gesture having mocked the creature as it tried to tackle him with the arms ready to grab him but Otto evaded it with sideflip.

Testing the monster's durability he used [Void Archives] and mimicked a single firearm form of [Judgement of Shamash]. Running around the town square to avoid it's increased attack speed, he let out multiple flash shots of the gun, all aiming for the lower rear.

The energy bullets pierced the sides and soon the Nuckelavee let out another cry of pain.

"Durability at an E..." He muttered, jumping over another attempt at a swipe from the Nuckelavee. "Both heads express pain from each part other than the heads themselves, fascinating."

The holes created from the gun began to be covered in black smoke eventually clearing, revealing unharmed black body.

"Smoke emits from the wound when injured, regeneratiom emitting smoke? Or...." He paused, having parried another grapple with his leg before he proceeded getting close to the Nuckelavee and kicking one of its legs with enough force to trip it once more.

"Or is it the body that is composed of smoke?" Curious, he aimed the mimicry and shot down the one of its rear legs and the left arm, separating the shot down limbs from the body.

The Nuckelavee let out a pained shriek, this time loud enough to actually force even the thin layer of dirt in the ground to fly back. The magnitude of such scream woukd have been enough to burst a human's eardrums but unfortunately for the creature of mythological origins, Otto's machine-like make ensured durability for even his hearing.

In short, Otto was just built different.

He walked away, giving the Nuckelavee time to recover and for Otto to observe its action and uncover its abilities.

Surprisingly, the removed limbs disappeared in black smoke, proving one of his guesses. The Nuckelavee, having enough of the threat before it, let out another shriek much louder than the previous one and then regenerated its missing limbs in a matter of just a few seconds. The upper body bended down before the upper head shrieked once more and then suddenly sharp bone-like protusions came from its spine and the bone face of the upper head of the Nuckelavee glowed with several red markings.

The entire body bellowed out smoke and coupled with the red eyes, it made for a scary sight for any people. Maybe it was the reason why the Nuckelavee gave such terror to the Orkney Islanders.