Lernaean Hydra

Nine-Headed Marsh Monster

The Hydra is one of Greek mythology's most iconic multi-headed monsters, originally the Lernaean Hydra of Heracles' second labor. With nine heads, the central one immortal, its most terrifying ability is regrowing two heads for every one cut off. Heracles defeated it only with his nephew Iolaus's help by cauterizing each severed neck with fire to prevent regrowth. Depicted as a massive serpent body with multiple long necks rising from it, it secretes lethal venom from its mouth, blood, and even breath.