Thank you for your input!  I like the semblance of an idea you have going there.  A neat thing about the lore of Protea is that when someone is interested in using it, it can be fleshed out in a way that suits the player.  As for the Pantheist Church, I thought of the Omen as a grim harbinger of misfortune to come, while the Bellringer -as in church bells- honors the dead.  Both are pretty foreboding deities, and a particularly devout Pantheist certainly might do something like that.

Overall I like your concept.  The only issue I see is with the unique physiology of the Sacert itself.  You might consider checking out concepts for Sand Dragons or Burrowing Dragons on google or deviantart.  I'm keen to see your concept further developed.