Alice

But Ikki could not move from his spot.
"Ugh!"
He felt as if his body was tied to the ground. When he turned his neck, he could see Arisuin's Device Darkness Hermit stabbed into his shadow. Arisuin had stopped Ikki's actions with a Noble Art that arrests a target's movement, Shadow Bind[13].
"Calm down. What were you about to do, jumping in at a time like this?"

===========================

"Yes. I understand it thoroughly. And I will not falter. I have already earned the trust of Hagun's main team. I will crush them in one blow. And my Shadow Bind is a Noble Art that can steal all their fighting capacity in an instant. There is nothing to be concerned about, Sensei. On the eve of the festival, I will undoubtedly present success. On my name as the Black Assassin."

================================

For the festival eve to go as planned, Kagami and her documents would have to be concealed until tonight. So Arisuin directed his shadow magic, and submerged Kagami and the documents within the darkness.
"Don't think ill of me. In order to implement the plan, we can't have uncertain elements."
And all of the traces were erased.

===================================
He could hear rude voices and many footsteps behind him. Turning his gaze, he saw the hometown gang members that he and Yuuri had associated with, all carrying guns and Devices. And they surrounded Alice in the blink of an eye, each of them pointing a weapon at him.

—I'll take everything from you.

And at the moment the outstretched hand pulled Alice's hair,
『Ah—』
Alice's vision exploded in furious red.

『Aaaaaaaaaaaaaaahhh!』

And—everything ended in a flash.
When his vision regained color… Alice was at the gang's hideout. It was a room that apparently had a thick coat of red paint splattered all over its walls. He was standing above the wreckage of those who were no longer shaped like humans, only meat. Amidst the vapor rising from scattered entrails, Alice's entire body was colored by blood.

============================= Not even Stella (10+ tonner) can break his shadowbind
Kagami's scream certainly arrived at the instant both Hagun and Akatsuki broke into a run. At that time, Arisuin had started to move. Standing at the end of Hagun's line, staring at the backs of his friends who were facing Akatsuki—

Manifesting multiples of his Device, Darkness Hermit, he arranged them in a fan on his palm.

Arisuin was aiming for that moment. He was here for the sake of that moment.

Arisuin's ability was a conceptual-interference type, manipulating shadow. His Noble Art, Shadow Bind, was an extremely strong ability that allowed him to completely seal his target's movements by stabbing his target's shadow with Darkness Hermit.

Once the shadow was stabbed, no matter how strong one's muscles, one could not break this binding. Even someone as strong as Stella would not be able to do it.