MAGIC
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Your character may be taught spells by his or her guild or priesthood,
at the collegium magii, or pick them up from a scroll of spells.
When you try to cast a spell, with the 'm' command, you can ask for
a list of known spells to be displayed by pressing the '?' key. To ask
for all spells starting with a certain prefix, type that prefix
followed by a '?'. The amount of mana a spell takes is displayed too.
Mana is the cost of casting a spell. Mana is not normally regenerated 
except when the player goes up an experience level, but various magic
items augment mana, and the sorceror's guild will recharge you for a fee.
Note that the amount of mana a spell takes to cast will vary during the
various phases of the moon. Therefore, when a spell is displayed, both
the 'standard' and the current amount of mana the spell takes are shown.
If you learn the same spell multiple times, the effective power drain to 
cast the spell is lowered. Some spells have a constant effect, while others
vary according to your level. The spell of ritual magic has a variety of
different effects depending on the circumstances under which it is cast.
The spell of high magic is the most powerful, by the way.