- last post: 01.01.0001 12:00 AM PDT
The Covenant worship the Forrunners. On the Heirarchs homeworld, there were Forrunner artifacts which they worshipped. The Forrunners could not have battled with any Covenant species, as the Covenant did not exist at the time.
The Covenant's technology is almost entirely leeched from existing Forrunner technology. Now, as for the Gravemind being a flood-infested form of a Forrunner... that is not YOUR idea. It has been discussed, and is quite possible, in my opinion.