After teaching them about the past events, Professor Elias Trantor tasked his students with researching the methods that the Arcanists used to defend against the Abyssal forces.
It doesn't matter whether it was a method used by different Arcane Arts Practitioners. Professor Trantor just wanted them to learn more about the past of the Arcanists and how different they were compared to today's Arcanists.
This was really an important subject, so they could all realize that the teachings within this Academy were on a whole different level. This should make them appreciate their lessons and learn passionately within the Academy.
Armin even witnessed a demonstration of an artifact called the Hexbound Gauntlet, a cursed glove that amplified curses but drained the user's vitality. Watching Professor Brin wield it filled Armin with both awe and caution.