- The Demons are a lifeform in the Generation 1 continuity family.
GO TO HEAVEN! LIFE IS ONLY ONCE!
Known to its modern population as Demons, Cybertron's original inhabitants were sealed away underground by Primus. Except for the occasional escape, they have remained sealed away by Primus's power ever since, known to the surface only in legends.
The appearance of the Demons differs, wildly, depending on the artist.
Demons are very large creatures (towering above Transformers) that can absorb energy without harm, up to direct weapons fire. At least one has demonstrated the ability to breathe fire. They 'feed' on Transformers by absorbing their lifeforce, eventually killing them.
However, if a demon absorbs too much energy, it will explode.
It is unclear if the Demons were the original inhabitants of the world Primus fashioned into Cybertron, or an attempt by Primus to create life that predated the Transformers. Cybertronian legend refers to them as 'the flipside of the Matrix's good creatures.'
Fiction
Marvel Comics
Two of the Demons escaped on Cybertron, killing three Decepticons that beset the Autobot Seawatch. They were destroyed by Emirate Xaaron, who consulted ancient Cybertronian lore to find their weaknesses. Demons!
After Primus's death, thousands of the Demons escaped. They were defeated by Grimlock, who consulted his fist down their throats. Still Life!
Classics
Mini-cons killed them dead.