Lucifer (planet)

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.

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.

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.

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 AllSpark Almanac
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.

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.