This change was something that Simon had personally noticed when his dungeon evolved to a [D] rank after his war with Gelgar. Yes, the only option that he could think of right now was increasing the rank of his dungeon.
Fortunately for him, it was not so easy to destroy a floor and the current adventurers weren't powerful enough to do something like that. He had enough time to upgrade and increase the rank of his dungeon before powerful adventurers came swarming inside his dungeon.
When Simon opened the door to the main hall, he saw that Irene and the other Valkyries were already present there and were engaged in a discussion of their own. Seeing them smile and converse like that, Simon was pleased that the closest people to him were getting along with each other.
