My plans on fielding at least half a dozen Castellax Class Battle-automata and probably two Thanatar Class Siege-automata require some Cortex Controllers to work properly on the battlefield. To get these, I am going to need 2-3 magi in my lists. Twice a Magos Dominus and an additional Archmagos Prime for large games.
The first Magos Dominus is based on a really common idea between Mechanicum players – the Vampire Counts’ Cairn Wraith. Mixed with a couple of Dark Mechanicus bitz and some Ork exhaust pipes the magos will propably become one of Nurgle’s busy flies after the heresy.
From my former 40k Mechanicus’s allies (using Necron rules) I will re-use the Destroyer Lord as close-combat-fitted Archmagos, bearing almost no weak flesh anymore.