AI having impossible promos?

This quest came up in a game recently. All (including future) melee units will get drill 1. And that's it. No upgrade to drill 2, 3 and 4.



 
Well that's pretty definitive. Thx.
 
Yeah, the main use would be to unlock the tier 2 promotions that are unlocked by drill I.

Is Medic one of those or does it require Combat?
 
Based on that screen shot. Yes, medic one is unlocked.
 
Don't feel bad, I had to go back and look to verify it. :lol:
 
Right. Event and UU/UB promos behave slightly differently.

Having just done some tests, it seems that using worldbuilder to give Drill 1 to a melee unit doesn't unlock the later promotions either. (Ditto for Guerilla 1 too).
 
The civlopedia gets its "what promos are available to / unlocked by / lead to" information directly from the info files.

I can only assume that the actual game code for choosing promotions doesn't just look at whether a unit is allowed to have a particular promo, but whether it is allowed the prerequesits as well. (I guess either as an error-trapping tool, or an anti-cheat function).

So a samurai can take Drill 2, because it has the prerequesit and is supposed to have the prerequesit. But a warrior with Drill 1 can't take Drill 2 because the game knows warriors shouldn't have Drill 1.
 
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