Jaana's hidden magic stat in U7 part 1.

[Powell Denton]

Jaana has a hidden magic stats of 12 and starts with 12 mana. There are two spell books available in Ultima 7 part 1 (one in Lord British's castle and the other west of Trinsic inside Destard in a locked chest.) But for some reason I couldn't figure out why Jaana can't use magic with either spell book.

[Dominus]

Magic is borged in britannia due to the ether being disturbed or so. Jaina can only do some limited magic for which she doesn't need a spellbook. Or something like that

[_Olarin]

Nobody other than the Avatar can use magic in Ultima VII. This is explained in-game by the damaged Ether, but is true even after you repair the Ether, and I suspect it was basically a feature that got cut due to time limitations. It's not a bug in Exult, this is the behaviour of the original.

However, if you play Exult with the Keyring Mod, it adds spellcasting for some other party members. (Jaana and Mariah are full-fledged mages, while Iolo, Shamino, Dupre, and Julia all have some limited casting ability.) The casting is dialogue-based - each character has a unique spellbook or other item, and doubleclicking it brings up a dialogue where you ask them what to cast - and some of the spells don't entirely work yet (most of the ones that need a target, specifically, like Heal or Fire Blast).

[TDI]

There is at least another third spellbook in BG. But I won't tell you were it is.

You should find it if you play through the game.

[Paulon]

There's also yet another one, making four I know of, in the cheat room, but no proper Avatar would know about that one.