SOLVED. Scifi Fantasy series with species-mixing. [s]

[Aurelio]

It's a science fiction (Space Opera) with Fantasy elements. Humans from Earth colonize this Planet in which they find a species that is compatible with them (they can breed with them, and they do). basically such mixing produces humans capable of using magic. This planet's society becomes kind of Fantasy-like, with a class system and magical dinasties and so on.
In the last book of this series, Earth is coming back and a confrontation is promised between the two civilizations.

[Sue]

Darkover series by Marion Zimmer Bradley?

[Aurelio]

Omg. That's it!
You guessed it in just 4 minutes! :O thanks! Amazing!

[Kris]

Glad you found your book series, Aurelio. Here's the link for Sue's find - the first book (publication order): The Planet Savers by Marion Zimmer Bradley.