Hamazura thought his breathing had stopped, but it was not simply due to seeing that organic wing.
Familiar words appeared in light on the mask covering the attacker’s face.
Equ.DarkMatter.
That was the esper name of Academy City’s #2 Level 5 who had confronted Mugino Shizuri.

[...]

He could likely not defeat them with just an assault rifle. Even the Level 5 the materials were created from had the power to single-handedly take on an entire military unit


Toaru Majutsu no Index vol.22 ch.11 pt.2