|Final Fantasy III Boss|
The player should have plenty of Antidotes on hand. The party should use level three spells, two of which should be enough to take out most of Giant Rat's health, then use two level one spells to kill him.
It is recommended to be above level 10. It would be ideal to have all four characters as mages, so they can all be on the offensive using Fira, Blizzara, and Thundara. The items Bomb Fragment, Zeus's Wrath and Antarctic Wind can also be used.