Reaper

The Reapers are a group of aliens in the Generation 1 continuity family.

The Reapers are a roving band of living weapons who want to give peace a chance... by killing everybody. They're led by a Deathbringer.

Fiction

IDW Comics continuity

This section covers fiction that is ongoing. It will be added to as the story progresses. If it isn't current, you can help by updating it.

According to the Deathbringer, the Reapers were warriors who caused utter destruction. But their prowess made them feared even among their own, leading to isolation and bringing them towards madness. They resolved to use their powers to destroy war within the universe, by destroying violent races and removing things worth fighting over. They laid waste to Mumu-Obscura, a strategically important planet, to remove it from the equation and spare needless future conflict. When Sixshot arrived on Mumu-Obscura to locate the Terrorcons, the Reapers attacked him, using it as a chance to test him. Deathbringer offered Sixshot a place among them, but Sixshot was still unable to sever his connections to the Decepticon. The Reapers accepted his decision, and said that they would cross paths with Sixshot again, hoping that he would then be able to accept their offer. Spotlight: Sixshot

After Sixshot was summoned to Earth, the Reapers followed, vowing to destroy whatever was left after Sixshot's work was done. Escalation, part 6

From Teletraan I: The Transformers Wiki, a Wikia wiki.