The Lernaean Hydra signifies the fulfillment of the second task of Heracles, although it was later disregarded. The monster signifies the victory of Heracles and a step forward in his path of redemption.
The slaying of the Lernaean Hydra also symbolizes victory over desire and the primary movements of appropriation. The significance has a very interesting story behind it.
The Lernaean Hydra is found in Lerna, the place of desires, a place where Zeus met many of his lovers. His infidelity was one of the main reasons Hera hated Heracles.
The multiple heads of the Lernaean Hydra signify the frugality of the human mind, mainly through doubts and fears. Like the numerous heads of the Lernaean Hydra