So Argos is the planetary core of Nessus that is converting the planet to a Vex "organism". The Leviathan "eats" planets for fuel and it has sucked in Argos where the trouble for Calus begins. Nessus is perfectly fine and never for once before CoO was it even implied that the Leviathan is sucking it. Also in one of the adventures on Nessus we intercept a broadcast to Cabal forces who are tasked with gathering geological data on Nessus (stealing it from the Vex) for someone. That somone is Calus and he wants to grow plants on Nessus. This is presumably the purple grapes we see on the ship. So, with all this in mind how is the Argos/Eater of Worlds story fitting into Calus' plans for Nessus as a garden and why isn't the planet's structural integrity damaged? EDIT: planetoid EDIT 2: I saw it. The Leviathan indeed drills Nessus albeit in small chunks. I expected the effect to be bigger. Thinking about this more Argos, may not be *inside* the planet as its "Core". It can be transforming it by flying around and doing work with its claws and that's when it may have been sucked in. I remember reading somewhere that every Vex planet had such a core inside it. Anyways, now I can enjoy the events transpiring a bit more ;)