Pandora | In Greek mythology, Pandora was the first mortal woman. According to the myth, Pandora opened a box and released all the evils of mankind. When she closed the box again, only Hope was left inside.
The Hydra, an ancient serpent-like chthonic water beast that possessed many heads , the poets mention more heads than the vase-painters could paint, and for each head cut off it grew two more, it's poisonous breath and blood were so potent, even its tracks were deadly. The Hydra of Lerna was killed by Hercules as the second of his Twelve Tasks