The delusion of Hikari's father in ??? transforms into Order Gigant to attack the party. After being defeated, it drops the Rune of Destiny, which allows the fusion of Norn. Order Gigant was actually Doe in disguise, though after being defeated, he runs further into the dungeon.
The Order Gigant's first line of business is to use Bestial Roar to buff itself and raise its turn speed, before attacking with physical skills. While it is weak to Electric and can be All-out attacked unlike most other bosses or F.O.Es in this stage of the game, doing so will prompt it to use Electric Screen immediately. As a result, it might be wise to simply leave it alone after hitting its weakness. It also resists physical, making it difficult to down using Critical hits.