For those who have clicked on this, I will unveil three pivotal moments. First, when the MC finally opens his gate, he will summon 15 gods, with half of them originating from Earth. Next, wen MC will disclose his true identity to the world, after which the Holy Kingdom will bestow upon him his final title: "Demon King Heathcliff." Lastly, towards the conclusion of the Holy War Arc, the MC, along with all the main side characters, will engage in a Fullmetal Alchemist-style showdown with the MC's older brother, "Holy Emperor Saleshin," during which the MC will become the first human 8-rank wizard.

Not realy spoiler, but Mc taught our little drawf on how to build nukes.

I won't say much, but the entire Baskerville family will reappear just like during the first demon hunt.