The River Styx is one of the most significant and fearsome elements in Greek mythology, often associated with the boundary between the living and the dead. In the ancient tales, the Styx is described as a dark, cold river that winds through the underworld, separating the world of the living from the realm of the dead. Its waters are said to be murky and foreboding, filled with the echoes of lost souls and the weight of death itself.
The waters of the Styx were also believed to have magical properties. Some legends say that the river could render anyone who bathed in it invulnerable, as was the case with Achilles, whose mother, Thetis, dipped him into the Styx to make him nearly invincible. However, since she held him by his heel, that part of his body remained vulnerable, leading to his eventual downfall the famous "Achilles' heel."