Elder Mythos Cultist alters the domain class feature so you only get one domain.
Hidden Priest replaces the first and eighth level domain powers.
Can these be combined? (Not for pfs, btw)
Thanks!
Nope. There's an FAQ that says something like: "If a class feature is replaced, changed, poked, prodded or interfered with in any way then that archetype cannot be combined with another archetype that alters the same class feature."
But since it's not for PFS talk to your GM. It's probably not un-balanced, so I don't think I'd have a problem with it.
Talk it over with your GM.
According to this table the two archetypes change the same class feature, Domains, and so are incompatible.
However, I can see what you're saying, and I can see how they can be combined, AND I can see how the flavor of such a character makes sense, so if I were your GM, I might be convinced to let it play.
I liked the flavor of the combination and I could see that, while it may be splitting hairs, they might not be the same feature, but I was worried that they were.
I remember seeing another archetype combo that thematically fit well, but there was some little crossover (both replaced the same class feature with the same benefit, I think) so sometimes that rule bugs me :-P
But I understand. Thanks!