Thirteenth Legion

The Thirteenth Legion is a group of Autobots from the Generation 1 continuity family.

The Thirteenth Legion (also known as the Lost Legion) is an ancient group of Autobots.

Fiction

Generation 1 cartoon

The Thirteenth Legion abandoned Cybertron after the wars that consumed the planet. They settled on the planet Antilla where they formed a thriving community with advanced technology.

The colony continued peacefully for some time until an asteroid shower impacted the planet and infected the Autobot colonists with Cosmic Rust. Unable to discover a cure despite their advanced technology, the colonists all died. Cosmic Rust

Notes

The written language of Antilla is Ancient Autobot, a dialect no longer understood by modern Transformers. This, (combined with other factors) places the Thirteenth Legion's break with Cybertron between 11 million years ago and 9 million years ago.