Katagmantean

Note: All of this is from me from what I have viewed of the game and is not the actual lore of the game. I think that the game developers didn't put much into the language of Portal Knights, so if you have any disagreements or anything to add on please do C:

First of all, if you look at the writing system, it looks a lot like the language that Atlantean language by Marc Okrand for the Disney film Atlantis: The Lost Empire. The writing systems look quite simular, in which they are kinda blocky and jagged, yet smooth in a sense.To read more on antlantean, look up this:Atlantean language - Wikipedia. Image result for atlantean alphabet

However, from the way that the residents speak, I would imagine that the pitches are much higher, and the vowels longer, which is why they all have that child-like squeaky voice. I would also like to add that after the fracture, the language must have changed slightly between dimensions. For example, in Landlubber's Leap, where everyone is a pirate, the language would probably evolve to more rusty, growl-like voices and ways of speaking, whereas in Fort Finch, the voices would turn more smooth and elongated. However, this wouldn't neccessarily change the language itself, but more so how it is spoken, kinda like how english and western people speak a bit differently, but they both speak english and can both understand each other. Antlantean is a real fanmade language, so if you want to learn that, I'm pretty sure you can find it somewhere on the web. If you then add the chimpmunk voice of the portal knights residents, then you have basically learnt Katagmantean which is awesome but won't really get you far in life other than fillinf your brain with knoledge. C: Hope you enjoyed!