Defense Points: 1,400
Enemy Spawn Point (Ground): Six
Enemy Spawn Point (Air): Two(?)
Target to protect: Two Main cores, one sub-core
Two main cores to protect: The Ancient Idol in the lower ground and Relic Lens win the upper ledge.
One sub-core in the middle-north. There are ancient statues along the paths that can be activated to release the energy and damage enemies.
Ruined Bridgeway leads to the eastern side of the Lens Core. Placing barricades right behind the Ancient Statue's range will allow you to hit enemies when they're stalled. Placing support defenses and traps will effectively block this path.
Both the Canyon High Path and River High Path converges in the sub-core in the middle. Though it is tempting to place defenses in the choke point where the River Low Path runs along, it's best to block the ramp northwest of the sub-core. This will give you access to the nearby Ancient Statue that you can place a barricade again to stall enemies in the River Low Path.
For the Canyon Path, There's a choke point where you can place barricades. Placing the Monk's Aura Boost tower in the middle, near the edge of the chokepoint is further strengthen the barricade. Like the others, place support traps and long-ranged towers to whittle down the enemies.
Finally, the Twin Bridge Path is also a short route from the west. The only good place where to block the enemy advance is on the bridge itself where you can activate an Ancient Statue to damage enemies.
The ruins in the middle can be climbed on and allow ranged characters to hit enemies from afar.