Alice device

The sound of disturbing laughter followed the two men's exit, leaving only debris and a burnt smell in the restroom, but from the shadows cast by fluorescent ceiling lights, Arisuin and Ikki popped their heads up as if out of black water. After confirming that their enemies had left, Arisuin raised himself from the shadows.
"Hmm, looks like they're gone."
In his hand, a dagger shined with dark gray radiance.
"That's my Darkness Hermit[8]. Quite handy, right?"
"A power to manipulate shadows? It's certainly useful."
"Well, in a brightly lit field without any obstacles to make those shadows, it's not quite so good."
Ikki had guessed the same. This power was better suited for assassins than for knights.