Infernocons

The Infernocons are one of the main antagonists of the 2017 film, Transformers: The Last Knight. They are a group of demonic Transformers that serve loyally to Quintessa, though they are also willing to serve Megatron. Together, they can combine to form the terrifying Infernocus!

The Last Knight
Having arrived on Cybertron, the Infernocons (combined into Infernocus) tortured Optimus Prime and watched him being restrained by Quintessa. When Cybertron finally arrived onto Earth, Megatron and Nitro Zeus returned to the planet with the staff. Together, the three allies watched the activation of the staff. After Cybertron arrived on Earth, the Infernocons assisted Megatron and Nitro in their battle with the Autobots and the humans. Commanded by Megatron, the Infernocons recombined into Infernocus to provide more destructive power.

The forces of the Autobots and the humans were being overwhelmed, until Optimus Prime later returned with Dragonstorm to turn the tides. Dragonstorm knocked the hulking combiner down to the ground, long enough for Optimus to catch Infernocus off guard and strike back at him. The Infernocons eventually separated to overwhelm Optimus, but were quickly decapitated by a single swing of his sword.