Prompted by a comment on AO3 that reminded me of one of the weirdest parts of the Legends universe: the planet D'vouran.
by lord Martiya

Year 18 of the Empire: Tarkin discovers Project Starscream

"I protest!" doctor Borborygmus Gog, a Shi'ido shapeshifter, shouted as soon as he entered the Grand Moff's office for his appointment.

"Protest for what, exactly?" Tarkin calmly replied.

"Your project, Project Stardust, got my Project Starscream interrupted for lack of funds!"

"I am only the supervisor of Project Stardust. Still, if you were to tell me about it, I may try and convince the Emperor to restore funds.

Gog explained the situation, of what his Project, aimed to create super soldiers for the Empire, had done and was doing.

"I see. Worry not, I'll make sure your Project receives everything it needs."

The Star Destroyers Executrix, Imperator (named after the lost prototype) and Oriflamme had came out of hyperspace around D'vouran, joining the Star Dreadnought Wrath and the Interdictor cruiser Veltraa.

"See, doctor, I always maintain my promises." Tarkin said to the doctor, who was forced to wear a device locking him in one form while standing at his side on the bridge. "And what a people-eating planet needs is a Base Delta Zero. Didn't think I'd find another world needing such treatment after Thrawn told me about Mugg Fallow the other day... Crew, you may fire when ready."

Base Delta Zero was an ancient code, dating back to the Great Hyperspace War. It was defined as an orbital bombardment with the goal of "systematic complete destruction of all 'assets' of production, including factories, arable land, mines, fisheries, and all sentient beings and droids"-that is, a bombardment that reduced the crust of a planet to molten slag, reducing all water in its component atoms disperded in the slag and blasting the atmosphere into space. The Anaxes War College defined a Star Destroyer as "any ship smaller than 2,000 meters capable of making a planet uninhabitable in less than a day with only the standard weapons", so it wasn't surprising that most Star Destroyers could execute it-through standard procedure called for three of the Imperial-class in either variant, to both reduce the time needed to just a few hours and to enact a blockade.

Ever since the Base Delta Zero code had been created, bombardment answering to this code had only been enacted twice: by general Grievous against Humbarine (unanimously considered his worst atrocity) and against Caamas by "mysterious parties" that had been recently revealed as Imperial officers. And now, Tarkin gave the order once again-though in a more appropriate situation than it had ever happened.

Borborygmus Gog found himself back on Kiva, near his main lab-or rather its former location, as Tarkin had it burned down, hit by light proton bombs from TIE bombers, struck with a capital ship-scale consussion missile, hit by a localized Base Delta Zero-level turbolaser bombardment, and then plowed and salted just to rub it in. It had been the final act of the Grand Moff consistently destroying all traces of his project. The reanimators on Necropolis-wiped out to the last, with Boba Fett procuring Cornelius Evazan, who had collaborated with him on that part, so he could be killed, revived, and killed and revived again until he had gone through all his twelve death sentences. The "blob" virus on Gobindi had been administered to any scientist who had collaborated and, as it thrived on heat, annihilated with an industrial-scale freezing device. The "Nightmare Machine" at the Hologram Fun World on Koaan, or rather the telepath posing as it, had been reduced to a gibbering wreck after scanning the Grand Moff's mind and what he'd like to do to him. The Essence Stealer had thankfully not been yet completed when Tarkin got to it, as Gog didn't want to know what would have happened.

And now he was back on Kiva, at the mercy of the wraiths of the race he had killed as part of his experiments, who had been informed in details of his role. And they were coming for him.

notes

Project Starscream originates from the novel series Galaxy of Fear, whose name should tell you everything you need. As for Evazan... Now you know why he got at least one of his twelve death sentences.