Fountain of Youth

Fountain of Youth is a sacred treasure of the Fairy Clan that granted anyone that drank it eternal life. Its water was drunk by Ban, who was forced to gain its immortality and became known as "Undead Ban" by Elaine who selflessly saved him.

Background
The creation of the fountain is unknown, but it is believed that licking the water will grant ten years of extra life, swallowing the water will grant hundred years, and drinking it all will grant eternal life and immortality. King was once its guardian saint, before he abandoned the kingdom, resulting in his sister, Elaine becoming its guardian for 700 years before ban arived. Without the fountain of youth, the Fairy King's Forest died out,

Side Story 1
The fountain is first seen when Ban, desiring immortality, climbs the gigantic tree in the Fairy King's Forest where the fountain is located, only to be repeatedly prevented from doing so by Elaine. Both annoyed by the other's actions, Ban then tries to grab the cup from a distance by utilizing his skills in manipulating his three section staff. He almost succeeds in drinking the water, but is stopped at the last minute by Elaine, who immobilizes him using her ability to control the trees' branches. She, however, soon realizes that Ban possess no malicious feelings and unbinds him, soon befriending within a week.

Later, when a red demon unnamed, who was from the Demon Clan, probably desiring immortality, starts burning the forest with its purgatory fire, Ban tries to kill it after instructing Elaine to take the fountain and escape. However, his attempts are unsuccessful,because a demon has more than one heart which he did not know, and the demon mortally wounds both of them. Since Ban did not have the strength to even drink the water, Elaine first drinks it, and then makes him drink it with a kiss. Ban, having now gained immortality, angrily and quickly kills the demon.