How do I make the mascot smaller

Hint 1 of 6:

Did you notice anything unusual at the Main Entrance this morning ?

Hint 2 of 6:

Professorr Moldybreadcrust was talking to a student.

Hint 3 of 6:

Check out his desk in his office.

Hint 4 of 6:

This spell *must* be opened with the spellbook present.

Hint 5 of 6:

CAST SRINKO ON MASCOT.