I couldn't finish 'em. Looks like this's gonna get complicated.
The Hydra is a boss in Final Fantasy XIV. The first of its kind encountered in the game, it is encountered in the trial "A Relic Reborn: The Hydra" as part of the Relic Weapon quest. Crucially, players must fight the Hydra with their unfinished relic weapons in order to complete the quest, putting themselves at a significant disadvantage as they are much weaker at that stage than other weapons of similar level.
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