[Archonsod]

Looks to me like the old Unholy / Holy difference is still there as far as blessings go.
ex - Ermor

Summon / Freespawn priests - can bless undead. If living (non Ermor) units are present too, the blessing will affect only the undead sacreds. The living, non-Ermor sacreds won't be affected.
Independent priest - won't cast blessing if there are only undead sacreds around. Casting divine bless with sacreds from another nation / independents will bless the indeps, but not the Ermor units.

I'm a patch behind at the moment.