The Induce Uzdo ritual surely summons darkness spirits, probably Dehori or powerful ancestors, although they could equally be dead uzuz. I thought that these spirits then possessed the male involved in the fertility ritual and gave them more potency. However, having just typed that, it seems to me that they would possess the female and give her the potency to produce better children.
By the way, Induce Uzdo is taught by Kaarg, but I reckon that it would come through Cragspider as well.
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