Initial Exploration & Settlement
These people brought Idurian as a common language. Friedport and most of the Chocolate Isles speaks it as such.
First Wave of Migration
These peoples ended up developing the Languages language, serving as the common language for commoners in outer (coastal) but mainland Horiza. Guilds and government still speaks Idurian.
Second Wave of Migration
These peoples ended up developing the Languages common language in the deeper parts of Horiza.