Please note that after completing a request from one of the exorcists, you will be unable to undertake another request until one Vana'diel day has passed.
Trade treats to the NPCs in monster costumes and see what happens!
You might be transformed into a beastman, or even receive a special item!
In general, "treats" are any sweets that can be made with cooking. Please note that there are some types of sweets that NPCs will not accept.
While in costume, you will be unable to use items or magic, or open doors.
To take off a costume, simply cancel the costume status icon or change areas.
During the Harvest Festival, you will see decorations resembling the bomb monster.
See what happens when you approach these decorations in a party of two people wearing a certain combination of costumes...
Try talking to the Moogles that appear in town during the event. They might have some clues for you!