Although I voted that the counter seemed to slow on large, now it almost seems to fast. I'm playing the Shiem and it took 500 years to get the counter to 40. I am the Shiem however, and also have the prophecy of Roanok, so I am probably much better at raising the AC then the AI.
Some notes about it: Up until it hit 40 the AC seemed pointless. There was no satisfaction from raising cities and building the eulogies just to see the counter go from 15 to 35. However, as soon as the counter hit 40 it only took another 50 turns to get to 70. Right then the counter seemed very bad (for everybody else) it has now stalled again, but I'm not worried, the next war should tip it over 100.
Right now the raise of the counter doesn't seem foreboding enough, it happens, but it doesn't happen easily and it could be put down quickly enough if the AI knew what it was doing. Personally I think the counter should go up once every X turns when Hyborem enters the game. That would probably give it a more foreboding and inevitable feel.
Is there any way you could add little things to happen when the AC is between 0 and 40? maybe something like a volcano or two, possible have some angels and infernals appear next to each other and fight it out, nothing terribly bad, but enough to get the idea that the AC is for real.
Anyway, overall the mod is great and the AC is one of its best parts, keep up the good work