currently we have  Twilight  Stonekin  Bandit  Lost Soul  Amii  but only a t2 unit exist yet Fire/Frost  doesnt yet exist Ech fraction has its own special ability or passive to them like bandit has their "life stealing" ability for Fire/Frost i would find it cool to have something simular to the Proton fraction of the game Starcraft where units and buildings getting buffed or boosted with pylons or energy fields.  something like small fast building towers lik Roo