Ancient Magic

Description
Ancient magic spells are Black Mage spells that deal large amounts of damage at the cost of large amounts of MP and long cast times. These spells are rarely used because of these drawbacks and should not be used for normal nuking.

List of Ancient Magic Spells
Freeze Quake Tornado Burst Flood Flare

Soloing with Ancient Magic
One technique Black Mages can use to kill things unaided is by taking advantage of the long cast times of Ancient Magic. While this is usually a drawback, this can benefit the mage when used with Sleep II. The Black Mage just has to cast Sleep II on the foe, and then cast an Ancient Magic. When the spell completes casting, they sleep it again. If they have MP to continue, they repeat this process. If not, they can somewhat safely rest to get some MP back. Next, they rest until they either each full or the monster wakes up.

The long cast times of Ancient Magic spells allow enough time for Sleep II to be recasted. If this method were attempted with normal nukes, it would probably not be successful.