When/how often can you buy tomes in the wizard and priest guilds? Is it every level or two levels or something? I'm wondering because obviously you can't get every spell in a class unless you work your way up to level 15 or something, and to do that in valeia and the early bits of ishad n'ha means you don't have the normal lot of baddies to kill when you change classes.....
At one point i levelled and saw about 5-6 books in the wizard guild so i bought them all and invoked them. now i've started messing with changing roles i hardly see any books at all and i don't really want to run back & forth to rumpy 500 times just to learn the spells, and to leave the monsters in the next zone.
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thanks for any advice