Primus

"Quote? You desire a quote? The One and the Prime does not give 'quotes'."

- Primus to a record keeper of the Fraternity of Order

Primus, The One and the Prime was the immortal ruler of Mechanus and the modrons. He was godlike in power while in his realm.

Abilities
Primus was considered a greater deity in Mechanus. His power over the modrons was absolute. All modrons obeyed the orders of Primus and carry out his plans. He was totally immune to all magic, and could issue telepathic commands to all modrons on Mechanus.

Ecology
Primus, although godlike, could be killed. Whenever slain, the highest ranking secundus modron was promoted to his position and became the new Primus.