Yeah. It's a co operative scenario included with Halls of Terra. You're fighting off heretics in name of the emperor attempting fend off coming of the black crusade. While getting corrupted by chaos. It's a solid get if you enjoy Relic. For a less stale game, I would do two heroes. Though doable with single I suppose.
I was able to trade for Relic last week and remembered that my FLGS had Relic: Halls of Terra sitting back in a corner for months. He sold it to me for 50% off