C2071 The Pride of Assassins

However, when I looked into the depths of the island, according to the direction, it should be on the southwest side. There was a faintly discernible black aura there.

I thought about it. Those black auras were either miasma or baleful aura. This was a relatively remote island surrounded by seawater. There was no dense forest on the island, so the possibility of it being a miasma was not high