What kind of magic do you like the most?

Prayer, for example, is magic.

I quote the description of prayer from the primary source – the game: "The Knight gains a special combat skill..." and so on. That is, Prayer is not only not called magic, but its non-magical nature is emphasized (combat).

Although it's hard to say, the developers called these schools magical.

The developers called them (Preparation, Rune Magic, Orcish Battle Cry, etc.) unique racial abilities; you can read about it here forum.heroesworld.ru//topic/2859/
It is also clear from here that orcs do not use magic in their battle cry and rely only on their voice (see question #10)