So... I got this faction quest, and I checked: I already have a huge monsoon, arctic and ice world colonized - that's three huge planets.

So why is this questi not finishing?

It doesn't say if the planet types have to be of a special type - and for the love of it then there doesn't seem to be any wikis or anything that explain the Lumeris faction quest in detail anywhere

Please advice.

Does it have to be 3 new planets? There's no counter for the quest to track how many you have/have acquired/are still missing.

oh and to the devs: Maybe make the text for the quest a little more specific to whether there are any kind of requirements for the quest.

It has to be desert worlds if you're talking about the one i think you are.

ok it doesn't say it has to be deserts - or any specific kind of worlds

but thank you

...now to figure out how to turn a monsoon and artic and ice world into desert worlds - not sure if the game allows you to terraform in that direction

Unfortunately, you won't be able to successfully terraform in that fashion. AFAIK, the only words you can terraform to desert while playing Lumeris is an Ash and Lava planet. You might have to start the colonization hunt. Best of luck!