Yamatai Gate Frame

Description
The best battle, they say, is the one you never have to fight. With formidable enough gates, the enemies will think twice about attacking any fortress. Not simply because the scale of the gates has them concerned about getting inside, but because large gates imply large inhabitants and armies get nervous when they think they might be outnumbered. Weapons barely chip it and even explosive powder is not enough to weaken it in a single blow. Siege weapons or divine intervention are really the only way to bring down walls this strong.

Repair
Repairing  requires up to:
 * 23
 * 6
 * 5