The Hydra is a dragon-like monster controlled by Ganondorf. It has nine heads that if one is cut off, two more will grow in its place.
The Hydra, in Greek Myths, was a horrible monster that had many heads and was slain by Heracles. On this wiki, its appearance and power is much the same. Before the war began, it was considered to be just a myth. Now, the people of Hyrule realize that it is not. Whenever one of its heads are cut off, two more grown in its place. It will be used to fight during the Battle of Lake Hylia.
Several Hylain soldiers were able to take it down.