Posts from Learning spells is a skill for scholars and unlocking secrets.

When playing through the campaign, it turned out that a secondary hero became stronger than the main one and unlocked the "Arcane Mastery" perk. Then, I decided to level up another hero, give him the "Scholar" skill, and have him learn spells. But it didn't work, either it's a bug or it's designed that way. In short, Ora has "Arcane Mastery" and "Mentorship"; I hire Orson, level him up in "Dark Magic" and "Education" with the "Scholar" perk, and I want Ora to pass on all the Dark Magic spells to Orson, and then Orson to Godric, but Orson isn't learning any spells, even though his "Dark Magic" is maxed out.
If spells obtained from the "Arcane Mastery" perk cannot be passed on, then the question arises: what about artifacts? For example, if the first hero has a scroll, such as "Berserk," will the second hero with the "Scholar" perk learn the "Berserk" spell? And further, if an enemy casts "Berserk" in battle, either from a scroll or a spellbook, will it be learned?

Added after 20 hours and 30 minutes
In short, I tried to learn spells from a scroll, but it didn't work. I did this: I taught the hero "Education" and "Unravel Secret," then used the scroll in battle, but it wasn't learned. The last thing left to check is to give the scroll to an enemy hero, then have another hero enter the battle and force the enemy hero to use "Berserk" from the scroll; maybe that way it will be learned, although it's a lot of trouble, I'm just curious. If anyone has tried this, let me know if this method works or not.

In short, you can learn spells from a scroll or artifact. It's a tedious method, but it works, purely for fun and for those who like to max out their heroes in campaigns. So, here's how to learn spells from a scroll. 1. Obtain a scroll. 2. Give the scroll to a secondary hero and engage in a battle with them, lose, and transfer the artifact to the enemy hero. 3. Have the secondary hero engage in a battle with the enemy hero who has the scroll, and use the "Uncover Secret" perk to learn the spells in battle. Then, use the "Scholar" perk to transfer the spells to the main hero.

Remember this!

You need to remember this!

Although it's obvious, I'll add that you can also learn spells from the "Tome of Darkness" in the same way. I think it doesn't matter where the spell is used in battle by an enemy hero, as long as it's used, it will be learned.
I'm playing through the original missions in "Tribes of the East" and I've maxed out Agrael's dark magic skills, and all the top-tier spells are already available by the third mission. There's a hidden artifact shop in the bottom left corner of the map; that's where I bought the "Tome of Darkness" and gave it to the enemy.
It's a bit of a hassle, and not really necessary, but... just for fun, I like to max out my heroes before moving on to the next mission.

And I'll add that it's not necessary for a secondary hero to win the battle; it's enough for the enemy hero to use the spells. Then you can escape and hire the hero again in the tavern.