Lieselotte, Arata and others in “Lost Technica and Problem Solving”

The term Trinity Seven refers to specific individuals. They've obtained the lost technica within their archives.

What's that mean?

It usually has terrible consequences for the mage who uses it. But I'm willing to take that risk with you.

What happened? Is this one of those barriers, or another world?

I'm afraid it's much worse than that. This is the secret technique of Acadia.

She's right. It's called Baal Peor, the last crest of the mage Pythagoras, founder of Logos Art, developed before he passed into the next realm. It takes a measure of all possible occurrences and drastically slows down time for all except the mage who casts it. To put it simply, it's the closest thing that exists to actually freezing time.