Lu Xuan was just a low-level spiritual planter, from an ordinary background with limited knowledge. He wasn't sure what this black thread was all about.,The bluish-gray stone wall was encircled by a ring of black thorns, densely covered with sharp black spines, serving as a certain degree of protection.,However, the defensive capabilities are barely better than nothing. They can only deter honest people but not cunning villains, let alone protect against those elusive and covetous strange insects and monsters who eye the spirit plants.。