@Pinniped, you make a lot of good points.
1. Who destroyed the planet?
Given that the quote was "Master Vookto used his powers of elemental summoning
to cleanse the planet with twin pillars of water and fire", I assumed he was responsible for a considerable amount of damage. An orbital strike might destroy a building or city block -- and
lot of orbital strikes might destroy a
lot of blocks -- but in a city-planet, that would take a long time to reach 100% coverage.
Two towering pillars of water and fire would demolish a building then scour its interior in
seconds, and if the pillars were following Vookto's path as he traveled across the planet on a starfighter... well, he could pretty easily cover a lot of ground in very short order. Considering that the funeral pyre honored Vookto because 'he gave his life to win the battle'... that sounds like there was nothing left to fight once he was done.
2. The numbers. You are assuming 95 billion losses by comparing Lianna to other city-planets.
Yup. 100 billion seems reasonable.
- Gerrenthum's population is listed as 5 billion... but it only recently (in the last 400 years) grew "from a sleepy Outer Rim planet into a modern megaworld", and there is no indication on its page that Gerrenthum is a city-planet at all, rather than just a heavily populated Rim world
- Humbarine's population is listed as 10-100 billion... but that's in 25 ABY. Look at the text: "In 20 BBY, Grievous's attack on Humbarine culminated in an hour-long orbital bombardment that reduced the city-planet to slag and left the world uninhabitable". 10-100 billion is the population after nearly a half-century to rebuild and recover.
- Vorzyd V's population is listed as 2 billion... but it is such an outlier to every other ecumenopolis, and there is (like Gerrenthum) no indication that it is a city-planet on the page itself. This is the only map of the surface, and it looks like a fairly standard city. More importantly, I'm not sure it's possible to be a city-planet with only 2 billion inhabitants. Unless the total surface of the planet is significantly small than IRL Earth's, or a lot more of the planet is covered in water or mountain or something else uninhabitable, it's nonsensical to imagine a city-planet with barely a quarter the population of Earth. I'm inclined to discount this as an outlier.
Especially since according to the map below, most (about 60%) of Lianna is water. The whole planet is not covered by the city. Lianna is also in the Outer rim, where the population density generally seems to be lower.
Huh.
Here's
a larger map of Lianna -- for whatever reason, the 'full size' is
tiny so this should be easier to read. But you are absolutely right; the bulk of the planet is not city, but
ocean. Given that map, I'm not even sure it can be called a city-planet, since there are two disconnected continents (which means there's two cities) and there's a patch on the second smaller continent that isn't urbanized. On the other hand, this map post-dates the Battle of Lianna, so there might have been infrastructure that filled in the second continent and/or connected the two continents across water -- the idea of '
sea cities' is not exactly new to sci-fi, and in real life the Chinese have been building artificial islands throughout the South China Sea.
However, you're right that this does lower the total population figures. Would you agree that the initial population would have been over 50 billion at least?
The battle of Lianna was never seen "onscreen", as far as I have managed to find out. It was only mentioned in a worldbuilding source and the mace windu comic. So we dont know what happened there, and the writer who wrote the summary of the battle might not be the same writer who placed Liannas population at 5 million.
Yup, I actually went searching for it.
The comic (the 'Mace Windu' one) shows the devastation of Lianna and depicts the funeral of Vookto. Later, that battle was fleshed out in
The New Essential Chronology, which is where the 'twin pillars of water and fire cleansing the planet' comes from. However, even though I found
a scanned version of
The New Essential Chronology, it somehow skipped the single page that actually covers the Battle of Lianna, so I don't know the exact description used.
We have no reason to believe there was any big coverup about Lianna. The jedi held a hero's funeral for Vookto, and nobody in the Senate raised the issue.
Also true, and also a good point. OTOH, per the comic, the 'hero's funeral' was only attended by a few Jedi and Vookto's clone trooper squadron (who had apparently been pinned down, and were saved by Vookto's sacrifice), and there's no indication that Vookto's role in scouring the planet's surface was more widely known (since everyone was either dead or evacuated...).
That's kind of why I can't stop reading "Shades of grey" even if I don't like it. Everything in it is an obvious power fantasy... but it's canon
I know, right? I mean, the story's been pretty objectively terrible for a while, but there's so much
stuff the story covers. At this point I'm basically using it for research for this and my
Gray Paladin quest, for cool things that might make an appearance.
Fate Denied is another good resource for that, albeit with
much better writing.