Stentarian

A group of Ammonites.

Eerily similar to the Cybertronians, the Stentarians are a race of transforming and combining robots. Sixteen million years ago, the Stentarian race split apart into two factions—the Heroic Terradores and the Evil Ammonites—and they have been at war ever since.

Fiction

2005 IDW continuity

The Stentarians were aware of the Transformers' war and the Ammonites went so far as to post undercover operatives within the Autobot army, such as "Paddox" who was serving as first officer aboard Thunderclash's Vis Vitalis. This was so they could poach the Autobot's military tech, but even that seemed to have no hope of breaking what both sides saw as an eternal stalemate.

When a squad of Ammonites led by 16444/9 were being pursued by the Terradorian Imperial guard across the Argon Nebulae, they tried to lay low on Hedonia and buy a new ship to throw the Terradores off their trail. They met the Autobots Whirl, Skids and Rewind in Mondo's bar there, but a Terradorian warcruiser carrying their leader Imperius Drax landed outside so Whirl decided to bring sixteen million years of war to an end by killing him.

This assassination threw the Terradores into disarray. Their new leader was more zealous than Drax, even threatening to destroy the Stentarian homeworld. In response, the Ammonites reorganised for a big push to end the war once and for all, recalling all of their deep cover agents. Now aboard the Lost Light with Thunderclash, Paddox revealed his true Ammonite nature and attempted to seize control of the ship, intending to steal its superior quantum engines for the Ammonites but was defeated when Swerve caught him unawares and knocked him senseless with Rung's alternate mode. Little Victories

A few weeks later, the war apparently came to an incredibly abrupt, and some might say "anticlimactic", end when all seventy billion Ammonites were destroyed fighting on Shockwave's behalf. ...And the Damage Done

TransTech

A Terradore named Imperius Argus once wound up in Axiom Nexus. Ask Vector Prime, 2015/11/29

Notes

• An event during the Stentarian war known as the Great Shattering prompted the formation of the Galactic Council.
• Although the Lost Light's quantum engines are better than anything the Ammonites have, in other areas the Stentarians are technologically ahead of the Cybertronians — all of the Ammonites are "omnicombinational" and they have ten-changing "Decabots".
• Going by 16444/9's comments to Skids, the Stentarians have or had some kind of empire, but with a monarch in charge, going by the Terradores using a royal crest and having an "imperial guard".