My sources are my interpretations of the terminal messages like the one where the Life Form communicates to the Mendicant Bias and small clues while playing halo games.
The sphere in the center of the ark clearly has some odd properties. One thing I found odd was during one of the first cut scenes where the core is visible I noticed weird linier lines flashing in a way that made it seem like there was more than 3 dimensions within the field around it. I also noticed it has an almost crystalline structure. This led me to believe this could be made of the odd crystals that are supposed to bend space and time. Maybe the halos are designed to matrix out this special rupture to either chance or “vacuum up this galaxy”. It would also make sense that this could be a Dyson sphere, or entrance to a Dyson sphere inside some sort of special rupture. Maybe this rupture is what powers the halo effect? I do know that inside the ark of the covenant (“reality”) it hold the word of god and that could be what the ark means in the halo reality… where the forerunner put the artifacts of their god.
If the flood ended up being what the forerunner worshipped it would make sense that that is why MB turned.
P.s. I might have been testing the peculator while I wrote this.
![Image](http://www.ascendantjustice.com/files/voc/followup/08.jpg)