This is the end game boss of the Horus system. To spawn it, you need 10 Quintillion. So be prepared for the grind.
Once you have spawned The Architect, I suggest the Unicorn Attack Squad weapon. I had this at a Power rating of 16 and took The Architect out in 8-10 seconds. So much easier with this weapon. It's also good for grinding moolah out by destroying asteroids as well. Makes quick work of everything in your way.