From the Dark Assembly, your characters can create new allies, who will serve as their Pupils or Students. A Master's stats will be increased to a certain extent by those of its Pupil, and he/she will also have the option to learn spells from the Pupil.
To learn a spell from a Pupil, the Master must be standing adjacent to the Pupil in question. The Master must repeatedly use the spell until it reaches level 1, after which he/she has "learned" it and cast it at any time.
After transmigrating, depending on the inheritance rate selected, the amount of experience the character has in a spell will decrease by a certain margin. Should a spell drop below level 1, the Master will no longer be able to use it, at least not until he/she retrains the spell by standing next to the Pupil and casting it some more.