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After having a delicious meal with everyone, we all felt ready. We packed things and immediately decided to move downstairs to confront the dungeon's final boss. The strategy I gave was quite simple.
I would go directly to fight the boss, with Erika, Eleanora, Erdrich and Elfriedden by my side, and I'll employ all my Familiars to overwhelm it all around its gigantic body with their Light-element Skills.
Meanwhile, the rest of our friends will both deal with the incoming mobs and also weaken the boss with attacks from a long distance. It was a rather simplistic plan, and we were mostly relying on our already very strong skills, spirits, and transformations.
It might have been more complicated if I came alone with my Familiars, but we were a very large group of strong people, so the difficulty was bound to become lower.