The second aspect of the academy system - at least for the unique batch - is the focused training of superpowers. As the faction with the access to the most superpowered users, one could say it definitely ranked at the top of eligible parties to declare that they were qualified to teach about the esoteric subject.
This, surprisingly, was a mixture of theory and practical, unlike basic tuition subjects. Dante would actually have to go to an area near the Zero Gate called the Black Land to learn and train his power with other unique batch students.
Checking the details of the Black Land, it was basically an area around the Zero Gate where energy from the other realm that produced superpowers leaked into our universe and formed a domain.
Those with natural superpowers or acquired superpowers could absorb this energy actively to improve the upper limit of their superpower's ability and unlock new skills or abilities within their superpower.
