Great tile improvement. Constructed by a Great General. * Effects: * Connects any strategic resource on the tile. * +100% Defensive Combat Strength for a unit on the tile. * Damages all enemy units that end their turn on an adjacent tile for 30% of their maximum HP. (Damage does not stack with other Citadels.) * File:GodsKings5 clear.png Instantly annexes all nearby tiles into your empire's territory. (Must be constructed on a tile within or bordering your own territory. Will NOT annex an enemy city if placed adjacent to it, but will damage all units within it, including aircraft.)