Lumos Maxima

"Lumos Maxima – An environment spell shoots a bright ball of light that persists for a certain amount of time."

You need to own Potion Master's Keystone gamepass to be able to open the door to the spell.

Location
Lumos Maxima Spellbook is located inside the Hidden Potions Cupboard on Floor 4. You need to touch the statue on Floor 4 with the keystone you get from Potion Master's Keystone gamepass to open the hidden door behind the statue.