RTF is a global modification that replaces all towns in the game.

In theory, yes, I read that initially there was emptiness and primordial magic, and then Ashha divided it into six schools and gave rise to six dragons.

But that's not the case!
Initially, there was emptiness and primordial magic.
Primordial magic, in the form of an egg, gave rise to two twins - Ashha and Urgash. Then, Ashha gave primordial magic six forms (without using the magic of emptiness) - emptiness is, in a way, the opposite (counterbalance) of primordial magic.