At this point, Fairy Sword Ji believed the rune formation already possessed considerable offensive and defensive power. It could hold Chi Xue and the others off for a long time, and might not be breached even if they attacked without letup. What was more, Feng Xi would continue improving it. With that, Chi Xue and the others would have even less chance of breaking through.
Besides, as long as Feng Xi remained inside the rune formation, Chi Xue and the others would not dare attack it. That meant Fairy Sword Ji and the others could go to the northern region of the God Realm. Perhaps even after they dealt with the Technology Cultivators, Feng Xi would still be working on the rune formation. If so, Chi Xue and the others certainly could not capture the Rune Cultivators and obtain their rune secret techniques.
Truthfully, Fairy Sword Ji had been waiting here for so many years that she was already growing impatient. She desperately wanted to reach the northern region of the God Realm and wage a great battle against the Technology Cultivators. Compared with the former, she was far more eager for the latter, which was why she kept urging Ling Tian and the others to hurry north.
"Although Senior Feng Xi is highly accomplished in formation markings and restrictions, and although she said that after improving the rune formation, it would be very difficult for Chi Xue and the others to break through, no one knows whether they're hiding other methods. They might also bring out Quasi-Sage Sixth Order cultivators. So there's still a chance they could breach the formation. If Senior Feng Xi has left it by then, she can hardly go back inside once Chi Xue and the others attack." Ling Tian saw Fairy Sword Ji fall