It is this easy#4

As I analysed the areas where they were concentrated, I found out that their numbers were directly proportional to the darkness, that is, the darker the area, the more the monsters were.

'So they are creatures of darkness or something?' I thought as I turned to her and explained what I had analysed. She then nodded before chanting something, as dark mana orbs formed at a distance from us before…

-Screech!!!!

All the monsters started screeching and running towards that dark orb. That little girl then moves the dark orb left and right all around the area, and I find those creatures crazily running towards the orb.

"They aren't merely going to darkness, but it's more like their whole life depends on it. Think of it as a drug to which they are extremely addicted." That girl spoke again, and I pondered over her words before speaking,

"And light should be opposite to that? Something along the lines of darkness is their salvation and light is their worst nightmare?"