I'm trying to figure out how to provide the player with a bonus on every barbarian unit capture. I'm not limited to a something particular, I just want to create any kind of reasonable thing. I was trying to find some modifiers but looks like it's impossible using only them. The nearest analogues are: - Gorgo's Thermopylae. Theoretically can be set for every leader to gain 50% culture on every barbarian unit capture, problem is that it will also provide culture in any other combat which is not good. - Montezuma capture as worker ability. Problem is that it doesn't work on barbarians, only on civs. - Boost of Bronze Working. There are no settings for this boost, it doesn't use traits like "on_barbarian_unit_capture", so also can't be used. The ideal thing is something working as Gorgo's ability (the amount based on combat strength) but working only in battles against barbarians. Also since I've increased improvements yield I think about reducing builders charges and having barbarians captured as builders with one charge looks good too. Is there any way to create some bonus attached to barbarian unit capture event?