The Masters of Dominus, are the self-modified former crews of battleships Scorponock and Maximus.
The title "Master" is held by everyone on Dominus, but some more specific variations are used:

Headmaster: Small (Size 1) Cybertronians that have changed their Altmodes to become the heads of a Transtector body, or the reverse where a larger Cybertronian has been modified into a Transtector.
Some of Scorponock's followers have large animal-form drones they Link Combine with.

Targetmaster: Cybertronians that have built drones that transform into powerful weapons.

Powermaster: Cybertronians with enhancement modes.