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Mana Points

Mana points are used to determine your ability to channel
magical energy from a god or deity. It is usually displayed
current/maximum. When you cast clerical spells you will
lose some of your current mana points. Items and a few other
things can affect your maximum and regeneration of mana points.
You can view your current and maximum mana points by using the
attributes command.

See also:
Attributes, Clerics, Druids,