With Minos' help, but also with their situation much better than it had been years ago, his group quickly exterminated the aliens and monsters in their path.
They were now much stronger and had better support from their companions, such as Ruth, who, with Minos' help, improved her regeneration after reaching level 99 and helped the group much more than before.
At the same time, being stronger and equipped with the weapons they had acquired in Obsidian City, the group naturally stood a better chance against those creatures that were unprepared or hadn't improved as much as they had.
The key to all this, of course, was Minos. His allies had improved at about the same rate as some of his enemies in Obsidian City over the years. But he was different. He had improved much more and reached a level that gave him the chance to completely upset a confrontation like this.