The Basileus' Aid
I jumped from the Terrestris Island, landing on the Palatium's grounds where the Basileus awaits. I have completed my training, but I can't still use any area spell yet. My body is still adjusting to the new core, so it will take time for it to get used to an insane amount of spirit energy and mana.
Mastering area spells is still out of the question, but despite that, the spells I've mastered like stone missiles, lava explosion, spirit hail, and other simple attacks, were enough to wipe out an empire from the map. The Terrestris Island almost crumbled to pieces when I used a Lava Explosion, cracking the island from its core.