Why can't I build the temple of Fervus?
Solution 1:
I've discovered the problem: The race of my city. I also note that none of the gods whose temples I can build are opposed. I was able to build a temple to Fervus in a Monsters city.
ETA: I've seen a holy ground for each kind of city. Humans get the most religious flexibility, being able to build a temple to any deity except Grumgog. Undead and Monsters divide the complete pantheon between them in opposing sets. Hence, Grumgog is Monster exclusive.
Here's the list of temples, for reference:
- Humans
- Dauros
- Helia
- Krolm
- Krypta
- Fervus
- Lunord
- Agrela
- Undead
- Dauros
- Krolm
- Krypta
- Lunord
- Monster
- Helia
- Fervus
- Grumgog
- Agrela