EP:1 CH:5 Covenant archeological teams operating on Requiem are searching for something. Infinity Command wants to know what.
The Cauldron map is designed for a more linear mission, rather than a Firefight style. We fight our way through some Covenant forces, on our way to recovering a Forerunner Artifact. The Prometheans take exception however, and we are forced to fight them of in the last half of the Mission.