The worm gods are the ones who control both the Hive and Ahamkara. They started the Hive's galactic genocidal campaign, and whatever they are using the Ahamkara for, I'm not really sure. Perhaps they meant for the Ahamkara to teach aid us in fighting the Hive, so that even the Hive would eventually be extinct, causing the "perfect galaxy" they are trying to attain.