Death monger cleric

1) The War Scythe is not the holy weapon of the Divine Trinity. If I recall, they use the spear. To armor, from what I recall of the Divine Trinity their priests are itinerant, travelling around the world to spread the word of their religion. In that case, heavier armor would encumber them.

2) There is nothing specific that would bar a worshiper of the Divine Trinity from being a member of the Azure Way from a religious point of view since the Azure Way is dedicated to the second coming of the Imperium (which, if you follow the propaganda of the current ruler of the First City, has already come to pass). They may be a bit LESS willing to accept a follower of the Divine Trinity because the Azure Way is (originally) a Coryani society, so accepting non-Coryani citizens (or those of nations that were once part of the Empire) could apply some bias, but as long as you work towards their goals I can’t see them making TOO big of a stink about it.

Also – for lvl 17, does it have to be third aspect (e.g., a cleric chose first aspect of Neroth, then Sarish) must it be now Beltine, or could he choose an aspect twice?