The Throne of Sovereign

There are Four Monarchs that want to sit in the throne of Sovereign. In the end no one get to sit the Throne, they fight for the rights of the throne until all of them died. Ofcourse they don't want the others sit the throne thus they left a legacy for their each successor to study their works, technique, and skills also a weapon and a full set of equipment. A game called'Ruler Shall Return's' is a popular at people because they can experience of being an adventurer fighting a completing a quest, fighting a monster, exploring the dungeon and finding a treasure chest. Zirx is one of the Monarch, he keep searching his own Monarch but nothing he can't find nothing a question came up with his mind 'Who was the Monarch, who left the legacy , why did the Monarch can't find in the the past' Nothing he can't find anything whether in the past or the books of history, he found nothing not even a clue until the day. He die, he was forced to log out he didn't know why but when he try to log in back he can't the only thing he saw in the screen was, [You can't login for 1 month (natural day)] Despair! Agony! Regret! That's the only thing he's thinking if only he fight for the throne, only if he did not find the legacy, only if...