The fortification is part of outpost can connect other towers, servie as a bridge for different functional buildings. The defensive outer wall is made of the same material as the guard tower. Only muzzle was left on the replaceable sealed wall. It is fully applicable for both defense and storage. The empty space allow more defensive troops or large defensive weapons. It can form a complete fortification with Fortification A.

SIB04
Main Frame x23
Frame decoration x35
Connector x48
Stairs x3
Railing x17
Auxiliary support x4
Decorative sticker x3
Manual x1