There Is an Outside Evil God There

After an earthquake, a mysterious mountain appeared out of thin air to the east of the town, attracting countless adventurers. Are there new monsters living on the mountain? Does the mountain contain rich wealth? Are there races with different civilizations on the mountain? No, there is only one person on the mountain, a person who comes from an outside world and is not accepted by this world. He is so unfathomable, unobservable, and unlookable. With fear, people named the owner of the mountain: The evil god from outside!