Wain had identified places where he could theoretically get a soul with the poison attribute, but in order to get the Plasma Destruction Sword, he needed one more soul.
'The last soul I need is a soul with the attribute of darkness. But, darkness is a matter that is unknown to the world before the apocalypse. Where should I look for a monster with such souls?' Wain pondered, jumping from building to building.
He thought for a long time and, at one point, looked up at the bright sun in the sky. That's when Wain realized that the answer was just around the corner.
'Huh, looks like I was too stupid. It's obvious that night is the dwelling place of all dark creatures. At this time, I will be able to find the right monster, at least I hope so.' Wain thought.
It had not yet been a full twenty-four hours since the apocalypse began. It was less than three hours until sunset. It was summer on this planet at the moment, so the day was long and the nights short.