The arcane practiced by fairies was developed from the sorcerer system and the divine system. Wendy had read most of the notes about the Creator. Although she couldn't understand most of the words, they still opened the Door of Truth for wizards because of all the information about life structures, the sorcerer system, world structure and the divine system. The notes were an insight into the mysteries of power.
If a level-four wizard wanted to remember something, he or she would still be able to remember it even after several hundred years. Arcanists were not only a different group of wizards, but they also belonged to a completely different system.