Hydra (ヒドゥラ) is the first Warden of Evolution. He lived in the Ocean Era, when the world was mostly covered with one big ocean.
| Spoiler warning!|
This section contains plot details of Ys VIII: Lacrimosa of Dana.
Do not read it if you have not played the game and intend to play the game in the future.
He and his race were living in the sea until the earth goddess Maia created the Great Tree of Origins and invited them to live on land. After they learned of the purpose of the Great Tree to foster Evolution through the Lacrimosa, Hydra tried to stop the fate of his people by building Seren Garden. The Tree of Psyches contained within could give him the power to stop the Lacrimosa once it grew enough.
However, the amount of psyches collected in his era wasn't enough and his race was wiped out during one of the Lacrimosas. As Warden and sole survivor, he eventually started to accept the Lacrimosa as necessary.