Lucifer

All it took to destroy Lucifer was a fat guy.

The planet Lucifer (ルシファー Rushifā) is a world under the command of the Decepticon forces. Heavily fortified and very unpleasant, it is not a place for tourists.

Fiction

The Battlestars

Fearing that the Autobots might attempt to resurrect their fallen leader, Optimus Prime, the sinister Dark Nova spirited his corpse away to the heavily foritified Decepticon planet Lucifer. Go Forth, Grandus of Justice!

The Battlestars fought past the hordes of Novaroid drones, storming planet Lucifer and securing Prime's remains. Sky Garry then used the power of the Zodiac to bring Prime back to life as Star Convoy. Resurrect the Legendary Hero, Optimus Prime!

Grandus then stayed behind on Lucifer to flush out the remaining Decepticon forces there, while Sky Garry mopped up the Novaroid and Galaman drones out in space. The Battlestars

Animated cartoon continuity

After the Decepticons had lost the Battle for Iacon, and thusly, the Great War, they were exiled from Cybertron. After a period of recuperation, they slowly began to rebuild their empire by colonizing several far-off planets, Lucifer amongst them. Straxus was given governorship of the planet, most likely as a reward for his wartime services.

It is said that, under the steel-fisted (don't even go there) rule of Lord High Governor Straxus, the place has gone from "oh boy" to "oh hell". If there were a tourist attraction, though, it would be the numerous smelting pools that take care of both energy-related needs and insubordination of all kinds. The AllSpark Almanac II

Beast Wars: Uprising

During her days as a guzzler, Buckethead lived on Lucifer, where she supervised construction efforts in Port Ronove until the colony's eventual collapse. Cultural Appropriation

Games

Transformers Roleplaying Game

Lucifer was a heavily defended Decepticon colony governed by the brutal Straxus, a self-sufficient foundry world capable of mass-producing drones, ships, and weapons in vast numbers. Megatron and the other members of the Conclave often made use of Lucifer’s ample resources and sophisticated industrial base to advance special projects and various evil schemes, including the development of antimatter weaponry and the creation of Nemesis Prime. Decepticon Directive

Notes

• The description of the planet in Animated continuity is highly reminiscent of Cybertron under the rule of Straxus in the Marvel continuity.