I would make caravans drop chests full of gold, feathers, bounty points, wood, potions etc.. Make the reward immediate for killing them. Think of it as one realm stealing the keep resources of another realm. Caravan killing can be a full time role like Robin Hood. Deny enemy keeps resources and loot the spoils for yourself.
Allow them to be killed by small groups. They are way too strong right now. Reduce the number of them, and have them take more indirect routes across the frontiers so you have to hunt for them. Maybe there can be a caravan kill tracker on the herald or realmwide announcements that a keep has been downgraded.
Allow them to be killed by small groups. They are way too strong right now. Reduce the number of them, and have them take more indirect routes across the frontiers so you have to hunt for them. Maybe there can be a caravan kill tracker on the herald or realmwide announcements that a keep has been downgraded.