I don't mean to open a can of works, but as a newcommer to Sandalak, has any substance been thought of for this religion?
There are some vague hints, but nothing too concrete. No one has really been all that interested in fleshing it out as a full-bore religion. We're all too busy shredding the other realms.
The Wyvern and Griffin theology is something like this:
The theology is basically animal totems. The Wyvern and Griffin are the two major war gods, but anyone is free to create whatever animal totem they want. One guy was obsessed with ducks, and he worshiped the Midnight Mallard. (He eventually decided that he didn't like everyone making fun of his Midnight Mallard, and went to Taselak.) The Wyvern and Griffin were the gods of the two smaller groups that merged to form Sandalak. The Wyvern is the desert war god, and the Griffin is the tundra war god.
When Kurlock was elected ruler, he had already accepted a death duel challenge. He lost and was killed, but was resurrected by newbie protection. He was immediately proclaimed to have been resurrected by the Wyvern, and titled himself the Wyvern Incarnate. He is the god king of Sandalak, sometimes referred to as Immortal Kurlock, or some other god/immortal moniker. Elaine was killed/resurrected a day or two later, and has dubbed herself the Griffin incarnate, or something. She's certifiably insane, though, and everyone mostly ignores her.
Oh, and the Sartanians in Sandalak have decided that the Wyvern is really just the local name for Sartan. Thankfully, everyone ignores them.
Beyond that, no one has developed any serious theology. A couple people have expressed some interest in doing more with it. Just be prepared, though, that a lot of people in the realm really don't want to have to put up with anything that distracts from the war game. The traditional use of religion as an alternate power structure to the main realm will go over like a lead balloon.