Septimius
Warlord
Sounds like the Sign of the Bear. This is the constellation event sacred to Mulcarn. Only one player gets the pop-up for the event, but its effects are global.
The terrain changes are only temporary.
Thanks for the info

Sounds like the Sign of the Bear. This is the constellation event sacred to Mulcarn. Only one player gets the pop-up for the event, but its effects are global.
The terrain changes are only temporary.
Nature adepts? What can they do to combat hell? Do you mean Life adepts?
You're right. Life I for sanctify.
Anyway, as I've found, the really bad thing about hell terrain is that your units get ENRAGED. Once they get ENRAGED they have a 3% chance per turn to turn into barbarians, unless they go into combat. You can lose cities instantly this way.
It is disenheartening to see veteran units with loads of promotions get ENRAGED and become barbarians.
With this being the case, and no way I can find to resist the rage effect, why would anyone want Ashen Veil religion (=increases Armageddon counter & hell terrain spreads faster, burning down trees & enraging units).
WoundedKnight said:Even if they don't have to worry about being attacked by barbarians, isn't there still the problem of enraged units in hell terrain turning into barbarians?
That's what I find the most problematic. It's not the fires burning down forests, or rampaging barbarians. It's losing my own veteran units.
Hell terrain is not what causes the enraged promotion. It's the arrival of the Avatar of Wrath when the AC hits 90 that causes it.
Wasn't there also an event that can add the Hero promotion to a unit? Or am I misremembering?
BTS 3.17 has been released as of today, and it does not like FfH. Civ crashes whenever I try to start a game, my save from 3.13 crashes also.