Multiple Priest Classes
One way to do this is to let the god simultaneously have several appropriate
priesthoods. They would actually constitute a single "priesthood" with several
different "orders" in it, each order dedicated primarily to one of the god's
attributes.
That way, if a specific god (let's call him Kyros the Storm-Shaker) is a god
of both War and Sky, two characters becoming his priests could do so in
different ways. One character can become a priest of the war-god; another is a priest
of the sky-god. But they belong to the priesthood of Kyros, each serving the god
in a different way.
Let's take an example from real-world mythology. In Greek myth, the god Zeus
was a deity of many, many different attributes. These were some of those
attributes:
Fertility
Lightning
Oracles/Prophecy
Rulership/Kingship
Sky/Weather
Strength
Wisdom
Therefore, in a campaign where Zeus is a god, a character created to be a
priest of Zeus could be any one of those seven types of priests.
In your own campaign, you can define any god as having two or more attributes,
and therefore two or more different classes of priests can serve that god.
That's the simple way to do this.
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