Mi-go

Mi-go does not refer to a proper language but rather a common pattern of dialects with common structural alterations to existing languages. All of these dialects are dead language and as such survives primarily on texts in old Stygian libraries, though it can also be found as runes on some jungle ruins. Due to its complexity and strange nature as a parasite language it requires 5 or more ranks in linguistics to learn Mi-go, though it only takes a single language slot. Additionally you are only able to understand Mi-go dialects of languages you already know.