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