well here is a design of C'Tan shard of my own design, pardon my crappy sketchy drawing. But I wanted to focus on a "utterly alien appearance" I choose the shard abilities: "Lord of Fire" and "Pyreshards" so from that I got the idea "How cool would it be if I made a C'Tan look like a living dark altar of some-kind" The three entities attached to its body are the C'Tan itself as is the large flame itself. Which I wanted the flame to look sickly, but I failed at that. As a ranged attack, the entities would have a arc of fire similar to turret in DoW2. The attack animation would be they would pull or gather fire from the large center fire and fling the fire at enemies within range. I know this probably may not be able to even be modded in DoW 2 or might be extremely hard to do, but I think this would be a interesting C'Tan for the Cryptek or as epic level unit similar to Great Unclean One or Avatar of Khaine. You could make it to were the upgrades could drastically effect the C'Tan shard's appearance based on what powers the player choose to equip.