Mana

Syntax: mana

Mana is the quantitative measure of your mental prowess. When you cast a spell,
it will cost mana. If you are low on mana you can MEDITATE or SLEEP to
regenerate.

As a command, MANA tells you the mana cost for all the spells you practiced.
You can check this anywhere. When command is used at a guildmaster, it will
show the mana cost for all the spells available to you.