There were ten major institutes within the Magus Academy, each focused on ten known elements.
Darkness Institute, just like its other counterparts, had a Grand Magus overseeing the whole institute as the head, with a dozen magus beneath her who took positions as instructors to teach all darkness acolytes over three academic years – totaling around 25,000 acolytes.
These dozen magus instructors possessed different specialities from one another which were distinctive to themselves such as darkness, shadow, death, or special ones like space and gravity; simply put, each branch of the darkness element had their own designated instructors.
Unfortunately for Emery, the one who specialized in the Law of Gravity happened to be one of Grand Magus Zenonia's disciples, Magus Cassian Newt.