Jon Godkiller (who they later called Ahuizotl after his father) lived in the skull of a great dead thing filled with crystals. The skull often flooded with the gifts brought by Water, and when it was dry John and his friends spent most of their time killing and eating the great Bloodbats who were the beloved children of the Healing God. This was, you'll recall, after Wolf died and let Fire remake the world. And remake it again and again until the land rose and fell like cheese in molten dough.
Jon liked to swim down into the pores beneath the bones, or the mulch as the men from the cities called it, and fish for things left behind from the days before the land melted. He had a collection of such artifacts and he would often ask Teacher, who was a speaker of the Voice From the Cave, for understanding of what they meant. Teacher made up stories but was in truth just as clueless as Jon. He had been thrown out of the Cave for some reason or another, or possibly it was all a plant so he might spread doubt of the other Gods in the guise of exile.
It was Teacher who put the idea in Jon's head to rob the great mating caravan that brought Water his annual shipment of wives. These women, chosen by lottery and gathered from across the realm, were given to the God and then drowned in the act of bearing his tadpoles, which he then devoured. Jon wasn't thankful to Water for bringing the rain and wasn't afraid of his priests, and he wanted a wife who was large enough that he didn't instinctively try to eat her.