I've made multiple conlangs. Three of them, all of which have many scrapped versions, are spoken in the same fantasy world. These are Sovã, Quoçiaolãç, and Unnamed Riverlang 2.3
there's a few more, but none are notable enough to mention :3
I somewhat actively share my conlangs' development on the discord server conlanging hub 
as for that world. I've written some scenes that appear in it.
Sovã, or the Modern Western Standard So Qhuān, is my most developed conlang. It has a linguistic history tracing back about one and a half millenium. I've worked out three stages of the language: Old So Qhuān, Shovāng aka Middle So Qhuān, and Sovã, aka Modern Western Standard So Qhuān. There is also Standard Eastern, and then a collection of smaller, southern dialects, which I haven't developed as completely. Words look absolutely disgusting, since the long history of the language led me to a place where it became its own thing, instead of something I've conciously chosen to make.
Originally, Old So Qhuān was inspired by both Western Germanic languages, and what, in my uneducated mind, the grammatical and lexical structure of Mandarin is, with a focus on having some form of case marking on articles only, and nominal TAM. I haven't actually researched Mandarin though, so it's just the vibes I get from that language. However, there is little left of this in Modern So Qhuān.
Modern So Qhuān, grammatically, is defined a mostly dependent-marking, mostly head-initial, mostly prefixing language, and can, I think, best be analysed as agglutinative, and between analytic and polysynthetic?? Case and definiteness are marked with clittics, which go in front of the noun phrase (I am aware of how insanely rare this is, if attested at all, but I only discovered this once it was a part integral enough to the language that I couldn't change it without doing more than a year of work)
Some notable features of Sovã:
there is a lot more to the language, but I won't fill this entire page with details on Sovã. I can speak about the intrecacies of its grammar for hours, though, even if I'm still developing it slowly
there is now a dictionary of this language here!!
Quoçiaolãç is the conlang I've remade the most times, everytime taking only the best elements of earlier attempts. I am somewhere between five and eight attempts, now, and I am pretty happy with it, at the moment. Words look absolutely gorgeous, in my opinion. It's mainly inspired by Greenlandic, with major influences from Nahuatl, for a large part for the phonology, though also in some other aspects.
Quoçiaolãç is a strongly prepositional, head-marking, polysynthetic language
In-world, Quoçiaolãç is the language that was spoken by the Ngimonians, before the Great Flood. It's the Language of Magic, for speaking it in certain ways can bring about magic for individuals who have been connected to the Great Machine. Nowadays, it's shunned and forbidden, though its many descendant languages are spoken by the Ngimonians.
Some notable features of Quoçiaolãç:
This is the least-developed conlang which I still plan to flesh out into a decently well-developed language. It's largely inspired by Basque.
In-world, it's spoken by the people of the Land of the River, which is the least developed area I have details on at all :3
Some notable features: