Big fortress's has 4 farmable leaders
* Archer
* Mage
* Warrior
* General
Each leader drops 800-1000 KE per kill. Except for [General] which drops 100 KE in all except for one fortress. This means that most of the fortresses has 25% lower KE output from leaders except for Southern fortress which has [General] with KE drop rate the same as all other fortress leaders.