On the surface Ermor AE isn't much different than in Dom2. But after just a few looks it is definitely :
First Soul Gate is now a national AE (big) ritual and not a different theme, so AE should end up playing like AE+SG !
Secondly Unholiness just was removed, Ermor has "normal" Holy priests, but they have the old Unholy spells as national spells and don't have the usual Holy spells.. This is globally equivalent except that now many AE commanders are sacred (Censors for examples) and can benefit from blessings, and that I don't know where the ex-Unholy sites went
!
Then the Unholy Sepulchre gives 15 gems instead of 10 on normal setting- that's +50% gems !!
Last- and this may be a bug - Ermor AE starts with 30000 pop as do other nations !!!, and not 5000 as before !
So it gets much more gold, to the point it may be a good idea to have a low dominion so people don't die too soon.
At Dom str 1 you lose only 500 pop/turn so have 60 turns before there is no people to tax...
Yet the manual states AE population is reduced at start