Timespike
A5E Designer and third-party publisher
You are correct. It is indeed a 1/3rd divine caster.I had to look up Ecclesiarch, and having it as a Marshal archetype is intriguing. I'm assuming it's a 1/3 cleric caster, and I've always felt that 5e needed more of those. The only one I know of is a Bone Knight from an Eberron book, Morgrave's Miscellany.