The Hydra is an enemy in Final Fantasy IV: The After Years.
Hydra is generally not a threatening enemy to the player, as they are easily fell in one Thundara or in most cases physical attacks. They can inflict Paralysis on a party member through the use of Constrict however, so they should be defeated quickly.
Hydras follow a strict pattern of Attack > Attack > Constrict, and will loop this pattern after Constrict.
Hydra was one of the spawn of Echidna, a many-headed serpentine monstrosity in Ancient Greek mythology. It could breathe poison, and indeed its very blood was deadly. The Hydra was killed as one of Heracles's Twelve Labors.The