Original Clay is the term applied to the magical soil that vibrated and pulsed with life.
It was this that Titan divided in two halves. One half he fashioned into a perfect sphere which he set among the Planes and called Titan. The other half of the clay was divided up by Titan and given to the Greater Gods to make their own creations on Titan. First the physical aspects and then the flora and fauna.
An ancient religion believes that it was Arn who set the clay for Throff to find. Certainly we know that the gods themselves did not have the ability to make life from scratch, hence the clay was indispensable to the creation.