The simplest definition is that a Sieratanrael is a human who has transformed, or adapted, or transcended, or (pick a verb--you'll find a range of them in old scrolls) enough to exist in constant interface with the life force of the world.

A lot more detail about that comes up when the first Sieratantrael in four thousand years turns up in Ride Anything Under the Sun and A Chain of Braided Silver.

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