tothePAIN, I think it's as OP in human hands, because Mandekalu removes the main disadvantage of regular horsemen, i.e. not being that strong against cities, so you can spam them alone (without the usual need for C-bows/swordsmen/catapults) to capture cities in the ancient/classical era, snowballing early on. Coupled with the Mandekalu's promotion and the UA, you'll be getting crazy high amounts of gold early on that you can use either for even more military or for shoring up other areas that you temporarily neglected while focusing on building Mandekalus. Going for Authority/Monument/Shrine/Pyramids/Statue of Zeus/Mandekalus spam is a surefire way of snowballing on a non-isolated map.
The base unit does, and the +1 food is an increased power from the base herbalist
is it that no Civ should have a unique horse, or just that the Songhai shouldn’t have a unique horse? Songhai give 2 unique combat promotions in addition to the bonuses on the Mandekalu. It’s possible that songhai’s combination of eliminating movement penalties and city penalties on an already fast unit that is strong for its era is a unique combinationAny civ with a unique horseman unit will almost certainly be too strong, it's just too powerful to spam stronger horsemen at the start of the game, so I'd be in favour of making Mandekalus a knight UU, I don't see any problem with another knight UU. The Songhai will remain very much unique due to its river bonus.
Pineappledan, that's a good question! My gut feeling is that any civ with Mandekalus/a unique horseman would be OP, especially in human hands, even without other combat bonuses. For example if you give Songhai Germany's UA and UB, they'll still be extremely strong if they continue to spam 8+ Mandekalus early on as I've seen them do in my games. Since you're proficient in coding/modmoding, is there any chance you could test an aggressive civ having Mandekalus without other bonuses?
It’s possible that songhai’s combination of eliminating movement penalties and city penalties on an already fast unit that is strong for its era is a unique combination