Faerly has no weighting towards either FoL or AV (or OO). Her religious weighting +25 towards Esus and -20 towards The Order, Empyrean, and Runes.
The problem here is probably not related to the religious weights though (these just modify the way it calculates the percent of their empire to follow a religion, so the AI is more/less likely to adopt it), but to researching technologies
The game ( def AI_chooseTech(self,argsList) in CvGameUtils.py) forces any Evil player who has the Philosophy tech to research Corruption of Spirit, thus founding the Ashen Veil. If she founds it before another religion spreads to her (or if the other religion is one of the good ones and doesn't have a large presence), then the AI will convert to AV. The code also forces anyone with the AV state religion to research Infernal Pact, if no one else has already done so, so that Hyborem will arrive.
The Ljosalfar will probably found FoL first anyway, since def AI_chooseTech(self,argsList) also forces them to go straight for Way of the Forests. Likewise, the Khazad are forced to beeline to Way of the Earthmother.
I see no reason why Faeryl should prioritize the Prophecy of Ragnarok any more than any other Evil civ. Maybe she is just getting Way of the Wicked too soon. Only Evil AIs can build this wonder, but there is nothing forcing them to do so.
I really think that it should be changed so that instead of having python block or force a civ to research or build anything they need to add more types of weightings. Each Civ, Alignment, Religion, and maybe Civic should have modifiers that change how much the AI values the tech, wonders, etc. These should even be able to make the AI assign negative value to a tech, so they will never research it themselves and won;t accept it as a gift either, but could be bribed into taking it if you give them something more valuable. (Thus, you may be able to pay the Bannor or Elohim quite a lot to get them to accept Corruption of Spirit.) I believe such a system would dramatically improve the AI, and making them play in a more effective and flavorful way.
