The Blackstone Mountain Range was a place where the Human Clan had established a stronghold in Heavenly Pillar Mountain's Contested Zone, and it was also practically adjacent to Demon Clan territory.
The entire stronghold seemed to have been built from a hollowed-out spirit stone mine. Not only did it have an external Protective Grand Formation, but its interior was also crisscrossed with mine tunnels serving as passageways.
Its interconnected composite magic arrays could even withstand Body Integration attacks when pushed into an overclocked state!
But powerful as the magic arrays were, they still required resources for daily operation and maintenance.
Such complex magic arrays naturally needed even more.
A short-term lapse in maintenance was no great problem. At worst, their operation would become a little sluggish, and most faulty formation lines had alternatives.
But if maintenance fell behind over the long term, more and more lines would develop problems. Once the formation's compensatory mechanisms exceeded their threshold, the formation could very well degrade or fail!
It could be said that most of the Demon Clan's encroachment on Human Clan territory currently relied on this sort of relentless attrition.
Directly assaulting formations was not cost-effective, so they targeted their supplies instead, weakening individual formations over time.
Thus, in these Divine Transformation-level conflicts that seemingly favored the Human Clan, the Demon Clan could rely on its enormous numbers and expend lower-ranking demon cultivators to encroach on Human Clan territory.
After all, the deaths of lower-ranking demon cultivators meant little to the Demon Clan. Their overall numbers were large enough, and they reproduced in sufficient numbers.
It was even a way for them to control their population.
And the Blackstone Mountain stronghold was one of their primary targets for encroachment-
Trumpet!
The phantom of an enormous elephant, seemingly a thousand zhang tall, descended