I gave this empathy idea a try, and I see it's pretty interesting to try to communicate with images instead of words. Also, it may lead to some interesting puzzles or even conflicts. Every Homin is attuned to Atys in his own unique way. Someone can only project vague images into other's mind, someone can only project feelings (You're suddenly overwhelmed by a sense of danger), someone - smells or taste, and so on. Someone's images get sharper as he gets more tied to the person he's communicating with, someone's images are equally vague to anyone - it can be a long list of possibilities.
And think of all the misunderstanding that can rise from. Ever played a game when someone guesses a word, another player has to explain it without words, and a team of 2-10 players try to guess what's being shown? It can get pretty interesting on a scale of an MMO!