Even though the class was advanced, the class only had a few skills. [Mystical Spirit Summoning], [Spirit Capacity (1/9)] [Invoke], and [Spell Vault (0/10]. That was it, the class only gave her four skills, and she barely understood what all those four skills did.
After learning the other skills for a few minutes, Zowen got the gist of the skill. Spirit Capacity was self-explanatory, the total amount of spirit she could have. Then she found out what the use of the spirit was after trying to activate Invoke. Invoke was the interesting one, and this was where the spirit came into use. Invoke would combine the spirit to create a spell, and the spell would be stored in the Spell Vault. The maximum amount of spells she could store was ten.