OS Spoiler - Question about the Isles

I kind of want to get the opinions of the fandom.

There seems to be no magic, and even no color in most of the isles: Deverelli, Unnbriel and Hedotis are all muted colors, and no magic.

Zehllyna has a small amount.
The Irid Island has a bit more.

Why do you think there is no magic in the Islands? Do you think it has to do with Dragons or Venin?
- Dragons: There is no hatching grounds, therefore there is no current of magic
- Venin: Venin have already drained the islands

Or do you think it is because of another reason? Perhaps it is because of the Gods? The least amount of magic there is, is on Hedotis, for an example, do you think Hedeon forsake Hedotis because the people have grown so far away from his teachings in the name of what they thought was wisdom?

I'm not sure which way I'm leaning so I wanted to get some opinions.