Yongasabi, Slugcat language of the Rain World Undergrowth AU
Yongasabi originally started as an attempt to turn Rain World's glyphs into a functioning writing system for the slugcats, and that eventually inspired me to make a language for the writing system to support. As it grew, it became increasingly intertwined with my own ideas for Rain World worldbuilding, and my own project, the Undergrowth AU.
Now I'm publicly opening my language to the Rain World fandom! Seven months of work from start to the official release, with fully functioning grammar and over 1500 documented words just at the time of writing this post, I'm excited to finally release this language for other people to view, and potentially even use.
Note that Yongasabi is made with the Undergrowth AU (which is an anthro AU) in mind. It presupposes that the slugcats are humanoid, and their technological development is further along than in the game. Despite that, the language should be otherwise applicable to regular slugcats.
While Yongasabi has been developed through the lens of my own projects (Rain World Undergrowth AU and its worldbuilding) and understanding of Rain World's themes and lore, it's something I want to be accessible to the entire community. Consider it something of a gift. Anyone has permission to use Yongasabi in their projects—credit would be appreciated, and I would actually be so excited if you messaged me to let me know what you were doing. If I'm available, I can translate things too, if you need, or explain concepts from the document. Just send it to me and I'll see what I can do! Good luck!