Dura 12

After he disrupted the combination, Ikki launched a full body attack at Ouma, whose stance had been broken.
It was a slash with all his weight thrown behind it. Moroboshi noticed something in that motion.
(The way he’s using his weight is just like the time he fought me.)
It was his sixth secret sword-Dokuga no Tachi.
Whether it strikes sword or armor, the opponent would be destroyed from within starting at the point of contact.
Using this technique, he could render Ouma’s steel body
meaningless.
Not knowing that, Ouma took Ikki’s attack without blocking or dodging, accepting it with his tempered body.
His body was attacked from within as if it were a bag of water.
The shock that entered Ouma had nowhere to escape, and so it ran over his muscles, bones, and organs-
“Tenryuugusoku”

“…!”
The shock should have hit him, but Ouma looked like he didn’t
even care.
Dokuga no Tachi had not failed.
The vibrations from his blade had definitely made it to Ouma. However, Ouma had not been moved.
That was, in short, what made Ouma Kurogane a terror. He had a force of will that transcended flesh.
He hadn’t spared any effort, realizing his resolution with steel-like sense of purpose.
Half-hearted attacks would not even be noticed.
Far from crying out in pain, without swaying even a little, he’d clad
his body in the stormy armor Tenryuugusoku.
Then, Ouma reached past Intetsu, which had been touching his chest, and sent Ikki flying back.
Ikki’s body tumbled in the air like he’d been hit by a car.
Aiming for his landing spot, Ouma swung Ryuuzume horizontally from where he was.
With the sharp sound of cutting through air, he released a vacuum blade.
It flew towards Ikki’s landing spot, with just the right trajectory to strike Ikki’s neck.
However, Ikki ended up deciding not to evade.
“Fu.”
Ikki took the impact of the landing by sinking into his knees, lowering his body.