Playing 7.11, the Clan researched infernal pact but no infernals appeared anywhere.
Whoa, looks like they did spawned afterall as I found a bunch of infernal starting units but they didn't have a settler (missing or killed early) so they never got any cities.
There's also something that prevents AI trading gold. At first it was all good, but then later at some point all civs as one showed 0 gold available for trade. It was strange but i didn't think much of it until I DoWéd on Sheaim and next turn saw a message saying that Os-Gabella have 60k gold for trade - a turn or two later it went back to 0 again. I then moved a shadow in one of the friendly cities and saw that they have 80k gold. WTH they all are saving for?