How do you build it?
Unlock it, gather the listed materials, select it in the Build menu and complete the required construction work.
Defense
A defensive installation for protecting a base from enemies. When a Pal is assigned, it will stop other work and stay on lookout and prepare for combat.

Unlock it, gather the listed materials, select it in the Build menu and complete the required construction work.
A defensive installation for protecting a base from enemies. When a Pal is assigned, it will stop other work and stay on lookout and prepare for combat.