In your possession now are a collection of priceless artifacts known as soul crystals.
Soul Crystals are gem-like magical artifacts that have the capability of recording the Aetherial pattern of their carrier which creates an imperfect echo or copy of the carrier inside of it like capturing someone's silhouette but also their emotion inside of it giving the crystal a sort of will of their own that allows them to pick and choose their owner.
When a crystal has chosen a new owner and attuned itself to them it will begin to release the stored memory, knowledge, and experience of the previous wielder stored within allowing for the rapid acquisition of or ability to control and use the skill and spell learned or created by the previous owner.
This allows for knowledge to be preserved and refined one generation after another pushing the discipline held within the stone to an ever greater height with each passing of the torch over the course of hundreds if not thousands of years.
Your collection has every stone belonging to every Job and the class that preceded them on Etheirys. You have the knowledge to create new stone and pass on the stone you have to others for them to learn from it.