I think the Ahamkara were hosts to the Worms, just like the Hive are. In the Book of Sorrows, Oryx expresses anger towards "The Dragons" and implies that they have also gained the attention of "[their] gods". Oryx's sister mimicked the Worms' "Oh [person] mine" after conversing with one, so it is likely that the Ahamkara mimicked them as well. An excerpt from boom XLV: "THE DRAGONS. Our gods should be ours alone. Their smug freedom is an insult to me. I’d shut them all in cells. Bring them to me!"