The upkeep of a unit represents how much it costs in gold per day to keep that unit fed and supplied. Units with a higher unit level and heroes with a higher experience level cost more to upkeep. If a leader is not able to supply a unit with sufficient funds, the unit's morale decreases. Low morale units may defect.
Upkeep costs by unit:
- Leaders cost no upkeep
- Heroes cost
5 plus 2 per experience level - Other units cost 2 plus
2 per unit level