The Gracken was an eight headed hydra found in the Black Water Swamp south of Valesburg. The mayor of Valesburg commissioned the party to slay the hydra after several reports of the beast terrorizing nearby townsfolk.
It was slaughtered very easily due to luck with attack and damage rolls for the players.
Hydrae are solitary creatures who prefer dismal surroundings. They gather only to mate.
Despite the hydra's size and multiple attacks, they are often preyed upon by dragons. They are impossible to train.