Also of note on the Almaj'aa ash divination.
I don't think they ever made it clear if the tradition is the divination from the adamantoise shell or if it is the divination from bones of great beasts.
It could be either as the Iron Tortoises are the single strongest mobs in the area that are not spoken and the specifically ask for that of Iron Tortoises, the strongest variant of the two present in the area. And given their habit of, as long as the person has proven himself they care not for their origin or appearance, they could very easily have adapted to use the biggest baddest foe in the area which is not even native to it. After all, they are also nomadic, they probably don't have access to the shells everywhere they go (or everywhere they once went).
"Biggest game of the area" is likely a more plausible actual tradition than "Adamantoise".