So I was flipping through UM and noticed the Theologian cleric archetype. Its focus on a single domain seemed interesting, and the spontaneous domain casting and free metamagic's on a certain spell of choice (from a list of metamagic) seemed potentially useful. But the list of free metamagics seems somewhat lackluster, and off the top of my head I can't think of any specific domains that would really make this archetype powerful, or domain spells that would benefit greatly from being always Stilled, Silent, Ectoplasmic, Extended, Intensified, Focused, Enlarged, Disruptive, or Bouncing.
The only domain I can think of where a higher effective cleric level would be most potent is the Animal domain, for the ability to have a companion at effective druid level +2.
Any other powerful or interesting combinations?
...and the spontaneous domain casting...
The lack of this very mechanic is what disapointed me most about all of the Cleric Archetypes we got.
Theologians can prepare domain spells in non-domain slots, but you CANNOT spontaneously cast your domain spells, or with slots used for your domain. Spontaneous Domain casting, as per the Urban druid, is much better.
I had toyed with a few Theologian Enchanter Builds, but not really gotten anything I liked out of the Archetype sadly :/