One of the 27 True Runes!
Also known as the "Rune of Life and Death", this rune represents two inevitabilities and was kept by the Village of the Hidden Rune until Solis 150 when Windy, along with Yuber and Neclord, destroyed the Village. The rune was passed on from Ted's Grandpa onto Ted, and Ted since wandered the world. Eventually, worn down by the Rune's curse and the social exclusion that it brought, Ted accepted the offer of the mysterious Fog Ship Guide to hand over the rune and disappear from the world. His exile lasted years, but when he saw the actions of the bearer of the Rune of Punishment (another heavily cursed rune) Ted decided to leave the Fog Ship and return to the outside world. The Fog Ship Guide was unwilling to part with the Souleater and battled for possession of it and the Rune of Punishment. Following the Guide's defeat Ted reclaimed the Rune and aided the Bearer of the Rune of Punishment in the war between the Island Nations and Kooluk. However, once the conflict was over Ted returned to a solo nomadic life.
After his wandering, he befriended the son of General Teo McDohl, Tir. After Windy realized that Ted bore the Souleater, he was attacked by Windy. Barely escaping with his life, Ted begged Tir to become the next bearer of the Souleater, which Tir accepted. Since then, the rune bent the fate of those around Tir and dragged them into the clutches of death, starting with Odessa Silverberg, then with Gremio, Teo McDohl, and even its own ex-bearer, Ted. However, it is uncertain whether having one's soul being sucked by the souleater means death, as the spirits of those who have died live on within the bearer of the Souleater.