The Protectors of Etheria is a stand-alone mod of the game Warlords Battlecry 3 (i.e. it can be run without having the original game installed - 100% free full game). It is an improved RTS/RPG game with new campaigns, quests, terrain, units, items, heroes, modding features and more. Beta versions available for download!
They aren't always around, am i right?
You can toggle their appearance by pressing r (v 0.7.2)
And now, in version 0.7.3, they appear only on selected units by popular demand.