Azure Underworld Mountain was an ancient mountain that covered an immense area.
A saying had long circulated throughout the Mí Lín Mountain Region: when Azure Underworld fell, Mí Lín would be overrun.
Its strategic value was staggering.
Azure Underworld Mountain spanned more than a hundred li from east to west, stretched nearly seventy li from north to south, and towered over three thousand zhang high.
It occupied a unique position in the Mí Lín Mountain Region-directly facing the Cloud Frontier Beast Venerable's territory.
Thus, the entire ancient mountain had long since been transformed into a massive fortress of war, divided into three defensive lines.
The first defensive line consisted of fortified strongholds at the mountain's outermost edge, along the border between the Cloud Frontier Beast Venerable's territory and the Golden Wing Sect's territory.
There were sixteen in total, each inscribed with an Origin Tier Grand Array and garrisoned by at least two Nascent Soul cultivators.
The strongholds were also linked by Teleportation Arrays. If one faced an emergency, the others could provide support at any time.
The current clashes with the Demon Race mainly took place along this defensive line of sixteen strongholds.
The second defensive line lay between the mountainside and the summit.
This line combined numerous airborne battle platforms with Grand Arrays and restrictions laid across the mountain's surface.
It was primarily garrisoned by squads of Golden Core cultivators. With the power of the battle platforms and the mountain's Grand Arrays and restrictions, even Nascent Soul cultivators would struggle to cross it.
It could also coordinate with the first defensive line to mount joint interceptions.
Its power was sufficient to withstand the combined assault of two Fusion Cultivators at once for a short time, giving it the strongest defenses among the five forward peaks.
The third defensive line