Many years ago, each of Echia's regions had their own language. Another language slowly formed in Echia known as The Trade Tongue by mixing words of each of the regional languages.
Finding that having a single language helped tremendously with trade and politics, all of the Echian clans slowly converted to using The Trade Tongue alone. This language is known today as Echian.
It is widely considered to be the most difficult language because there are many rules that govern grammar and pronunciation. For example, the proper pronunciation is affected by the old language it came from rather than just phonetics alone. Only native speakers of Echian tend to speak properly.