So, here's another how to build question. I'm thinking Telepathy would work for this but I want to put it forward.
I have a race that is incapable of verbal communication, among themselves, they communicate through pheromones, exactly the way that ants do, though with far greater complexity. This form of communication is only capable between members of this race and is not a thing that other races can mimic or learn. I'd also like to keep it relatively short ranged to account for dissolution and confusion thanks to dispersal and wind currents.
How would you build that?