The Pheromone Gland! The ol' faithful. Who would have thought that the simple mutation of the language gland would have such far reaching impact? Come to think of it, packing the capacity for language into one mutation is a little generous of the System, isn't it? It's not the sort of thing that Gandalf is known for, the stingy bearded bugger. I wonder if this became some sort of standard mutation for more intelligent bugs down in the depths? It does teach language, not really, it just expands the range of scents the pheromone gland can produce to have sufficient gradient that language can be expressed. It does increase it a lot though… The pheromone gland went from "danger, food, warm, cold" to "hello guest, please be welcome. Care for some tea?" all in one mutation!