Harbinger: "Yeah, little Abomination was born just as an embryo! Wasn't my fault though, that stupid guy Shepard blew up Sovereign and I had to make him. Even better, then comes Shepard and ruined everything, AGAIN! Man I hate that son'of'a'bitch!"
This is the core of a reaper sovereign -ship-. They are what reapers usually look like, the squid/cuttlefish/scorpion/louse duplicates house the actual reapers. It's like having a ship graphed to you basically. -_-