Alter Aeon Online Help

Keywords are:  'books spellbook tomes manuals'

Certain skills and spells are too high of level or too complicated to be
learned from most guildmasters.  Only those of exceptional talent ever
master some spells, and these masters often keep records of the experiments
and tests that allowed them to master those skills.

Spellbooks and tomes can contain such information, and through the use of
the memorize command, can give you insight into learning the spell for
yourself.  Of course, the hard part is getting the spellbook from the master
who wrote it...