Heralds are the instruments of their god's will on IIo.  Anyone may eventually become a herald, but they must be approached by and empowered by their god. When encountered, heralds appear as they did before becoming a herald, but blessed (or cursed) with an otherworldly essence. More powerful than others of their own kind, heralds bring about events they believe their god wishes. Sometimes, heralds are encountered in groups led by an Avatar of their god; these small groups are more powerful than entire armies and only form when the need is great.