The "Fountain of Vitality", despite the name, it's not an actual fountain, it's an hourglass made of Copper and Silver, with the Nordic runes, Gyfu and Odal, carved in each one of its bases, it's sand change colour depending on how much vitality its contained inside. When a human flips the hourglass holding the Gyfu end, his life will be drained from his body. If a person flips the hourglass holding the Odal end, he will gain lifetime and health.
Subjects who have used the Hourglass to get vitality seems to develop a need to keep using it, making the subject even force personnel to fill the hourglass if its empty. If the subject is deprived of the use of the hourglass, it will attemp to reach it at all costs, if the subject fails, he will then proceed to commit suicide by ripping it's throat off.
It was discovered in the Amazon Rainforest, by the Kambeba tribe.
There is a local legend that says that a long time ago, yellow-haired men came to those lands, and left the object in a cave, almost as if they were trying to hide it for some reason.
That's the basic of it; I'm working on the details