Well, so far every time I've summoned the infernals it was to switch to them, and my first act afterwards was to give my former civilization the wisdom they lusted for by teaching them the folly of summoning Hyborem when you are relying on warriors to defend your cities It's just too tempting. And I imagine it is the same for the AI : a civ that races for the Ashen Veil is probably underdefended militarily and a very tempting target. And everybody else hates it if it switches to Ashen Veil (since nobody else will have that religion), so...
How about this instead : the civ that founds the Ashen Veil gets a unique unit with a "Summon the Infernals" ability. Then that civ can move the unit into a place of its choosing and trigger the ability, summoning Hyborem in the most inconvenient spot for the civ's enemies that it can safely reach...
How about this instead : the civ that founds the Ashen Veil gets a unique unit with a "Summon the Infernals" ability. Then that civ can move the unit into a place of its choosing and trigger the ability, summoning Hyborem in the most inconvenient spot for the civ's enemies that it can safely reach...