Wall

"Walls are your Keep's most important defence. When your walls are destroyed, your keep will be randomly relocated elsewhere on the map"

- Game of Thrones: Conquest

Usage
The Wall provide a City Defence bonus which can only be damaged by Seige Weapons. If the Wall is broken, by taking the City Defence to zero, then the Keep is randomly teleported to a different location on the map, and is given a 24 hour peace shield. A damaged Wall will be slowly be repaired over time, and does not need resourees to repair. The Wall also stores Traps, and will provide a higher capacity at higher levels.

Upgrade Requirements
Below is a table which shows you the power, Trap Capacity and City Defence for each level, and the resources required for that upgrade: