As mentioned in 'help aradian', ambient mana is gone from Aradian, owing to the
death of Kefka, who had taken the Goddesses' power and become the source of
all magic in Aradian. Travelers who possess innate spellcasting power can
draw entirely upon their internal reserve of mana to cast spells, but this
is far more difficult than ordinary spellcasting. As such, all spells in this
world receive a 100% spell cost penalty and a 25% cast speed penalty until the
Mount Taken quest is completed. See 'quests taken' for further details.