Put in any alchemical and medicinal spells they have into it as a cover story for their chosen student.
Told to store all spells learnt and notes taken on them into the crest for later study.
Told to store all spells learnt and notes taken on them into the crest for later study.
Most just tend to have shifty circuits, Shinji level shifty circuits.
If the family were to all concentrate on gathering everyone's natural circuits after a point it would at least have an impressive number with how many members they have.