"Boundary Stele?"
Mu Yuan had always valued enchantment-related treasures and had long thought about purchasing a set of real city defense barriers.
However...
A city defense barrier that could engulf an entire city would undoubtedly be of epic level, and as a large item, its value would be at least equivalent to several treasures of the same rank.
There were indeed such items on the Taixuan Covenant Platform.
A total of three sets.
Water Veil Skycloak Barrier, Ten-Thousand Woods Sustenance Barrier, and Red Lotus Karma Fire Barrier;
The first two required six-star Pioneers, or authority equivalent to this rank to exchange, while the latter could only be purchased by seven-star Exploration Generals.
Mu Yuan did not have this authority.
He didn't even have the financial means.