An extreme, despair inducing magical energy that made me wonder if it could even
stand up to Rhongomyniad.
Now, that same feeling was leaking out of Touko's own body.
This was the true form of the contents of that bag.
"Long ago, I got done in by surprise, so I've learned to take some countermeasures.
Now, it's in here - oh, and don't worry. It is restricted to acting as a Counter. As long as
you don't get in its way, it won't hurt anyone but the person who attacked me. Lord
El-Melloi II, I'll be dropping by later to pick up those cigarettes."
With another crack, Touko's stomach broke open. Clothes, bone, and flesh alike split
apart as if she was no more than a statue - and inside the open wound, a kind of 'door'
awaited.
An oppressive darkness.
Not endless, but without dimensions altogether - an eternal, infinite hell.

The Case Files of Lord El-Melloi II, Volume 3, Chapter 3, Part 5