Philosopher's Stone

Philosopher's Stone is a hidden treasure supposed to be exist in the Holy City of Renaie. Basically, it's a godly material which can change the balance of the world, like reviving dead, becoming immortal, etc.

History
Around 3000 years ago, the first holy king discovered it sleeping deep in the earth. It said that it became the foundation for the development of the Holy City.

Trivia

 * Leo Demonheart had once used it.