What kind of magic do you like the most?

I don't know about others, but I can't bring myself to call Knight Training "magic" (there's nothing magical about it), whether it's "special," "neutral," or some other kind of "magic."

Prayer, for example, is magic.
Even though it feels wrong, the developers labeled these schools as magical.

The official description of the second expansion pack states that Orcs do not possess magic.

Exactly, it's not standard magic, or even magic at all. I repeat, it's a racial trait. Following this logic, you could call the entire skill tree "specific magic" because it's closely intertwined with racial skills.
These questions are not for me, but for the developers, creators, and publishers... Why can a Shaman cast Haste? Moreover, the Daughter of the Sky casts Chain Lightning! And yet, the abilities of the Shaman, Daughter of the Sky, and Daughter of the Earth are labeled as "Spellcaster." There is mana for spellcasting. And the Orc hero has mana for spellcasting. And the Orc hero casts Astral Gate just like any other hero.
Orcs do not possess the full range of standard magic. Only a very small part. But they can still cast spells. And their school is specific – the magical school of war cries (MAGIC_SCHOOL_WARCRY).