Stentarian

The Stentarians are a slightly tall omnicombinational robotic species.

Biology
Stentarians are robotic in biology and they have the ability to fuse with other members of their species ranging up to sizes unimaginable

Primax 1005.19 Gamma
Around the beginning of the Earth Stone Age, the Stentarians split into two factions, the Terradones and the Ammonites began a long and brutal civil war which caused a hatred towards all metallic life by the Galactic Council, the Ammonite faction infiltrated the Cybertronian Autobot faction, including an attempted invasion of Cybertron.

Primax 215,19 Epsilon
The Stentarians (called the Ammonites in this reality) come from the Andromeda Galaxy, and first made contact with with the races of the Milky Way when the Maximals and Predacons sent out an extragalactic expedition to Andromeda, which caused a catastrophic invasion by the Ammonites, making the Maximals ban intergalactic travel for all Cybertronians.