I worry a lot, lacking of wood in some maps like Anatolían Plateau. Other lacking is cívic techs like as we can found in a governament center. (AOE)or library (AOK), laws, aristocracy reforms, historical festivals and religious tech that affects other units beyond than healers. Some ideas: After life. (Soldiers def. bonus) Fanaticism (soldiers attack bonus) Divine ancestry (hero defense bonus) Holy war (experience bonus) Destiny ( hero attack bonus)