The Doll Demon Sword User and the Growable Mobile Fortress

On this continent called "Phariethon", there are five intelligent races: humans, demons, elves, dwarves and demi-humans, collectively called "primates". They are blessed by the gods and live a rich and prosperous life. Ten thousand years ago, the evil god "Abys" came to the far north, bringing "minions of the abyss" that spread pollution and death. The gods gave the five races five magic swords and magic to fight against the evil gods and minions. As a symbol of the unity of the five races, the five races selected five magic sword users to lead the primates to launch a counterattack. The ancient war was long-lasting and tragic, and in the end, the gods had to die together with Abyss. Ten thousand years later, the gods and the old civilization have turned into the dust of history. All that remains are legends and relics buried deep in the ground. Only five magic swords are left to be passed down, and they are still choosing the suitable ones. The magic sword will bring powerful power to those who are suitable. Becoming a magic sword user means obtaining the blessings left by the gods. Therefore, they are regarded as guests by all countries. In the autumn of 387 of the Sixth Age, the country "Seleuria" located in the middle of the continent sent a scientific expedition team to inspect the war relics left by one of the previous generation of magic sword users, in order to solve the problem of why the fourth magic sword has found a suitable one, but the fifth one has not yet appeared. One person from the scientific expedition team will be killed and become the fifth Demon Sword user.