: Since mercenaries are often on the move, this feature could introduce a mobile "War Camp." You could upgrade this camp to include a mobile blacksmith for repairing armor or a training ground to level up your troops faster while traveling the global map.
: Instead of just swearing allegiance, you can negotiate specific "Sell-Sword" contracts with the 20 existing states. These could include objectives like "Sack three villages in 10 days" or "Protect [Lord Name] during a siege" for high-gold payouts.
: As you complete contracts, your mercenary guild gains "Infamy" or "Renown." Higher infamy allows you to recruit higher-tier units—like Elite Knights or Expert Archers—without needing to own a castle first.