Kyran's brow furrowed upon seeing the organs placed as an offering at the foot of the obelisk. He had read from one of the books in Stella's study that during the first era of the world, people offered their firstlings to the Spirits.
These Spirits should not be mistaken with the ones contracted by summoners because these beings were what people believed to represent magic in the world. To them, as long as they diligently placed their offerings to their altars, the Spirits would allow some of the young ones to absorb the energies in the surroundings to summon magic once they turned six.
It was not until the Enlightenment Era that humans learned that Spirits did not 'allow' people to absorb the energies. It just happened that there were people who managed to awaken their magic at the age of six, and some failed.