Sunny glanced at the old scientist with interest.
"Causality? Do you mean its reason?"
Professor Obel smiled.
"No, nothing so philosophical! What I mean is that we are exploring the cause and effect of various phenomena having to do with the Spell, as well as correlations between them. Of course, our study mainly has to do with the Nightmare Gates, but since nothing exists in isolation, we need to consider the system in its entirety."
Sunny considered his words for a while.
"Is this how you make the Obel Scale work?"
The old man shook his head with an amused look.
