The Priests of The One are shaman scholars, showing the way of The Spirit, The One to the people. They do not like being called a church, as history has shown that all churches eventually become organizations and dominant ones.
(Name translates directly from ancient Egyptian as: Strong Protector, the Hidden One.) A mysterious shaman appearing without regard to wheres and whens, upon the divine bidding of other Realms. An entity of legend, belonging to a legendary and ancient sect.
A devoted and zealous priest of the Ice, Irad nevertheless is troubled by the brutal and vicious ways of those who worship it. Rather than crush and destroy the civilized folk of the South in its name, he would rather they be converted to the faith of his people and worship the Ice as their master. This he feels, can only be acomplished if they are encouraged to revere it rather than loathe it. It is indeed ironic that such a gentle and wise man serves the twisted Ice Lord..
Centaur-crafted marching drums, imbued with firey power.
Macu spends his time looking for kind and giving people who he rewards in some small way. He does this by disguising himself as a needy person, maybe an injured traveler on the road, or a beggar in a town. The first person that responds kindly to him will receive some assistance in the endeavors, they will find out about the assistance when Macu has finished helping them. If a party member is simply indifferent to Macu then Macu will give the party another chance, in a different situation, if the party is still indifferent then he will leave them alone without interfering with them anymore. If the party is cruel or evil in anyway to Macu then he will punish them is some suitable way that matches their evilness. He will even show himself to them so that they will recognize him and the fact that they were evil/cruel to him.
The secret for immortality has been discovered by an eccentric wizard/mad scientist. Its found you need to reapply once a month. As people stop dying, and the birth rate increases exponentially, people are forced into homelessness, because of the need for food reamins the same, and food is not being produced fast enough to feed the undying population. The PCs have to find the creator and kill him, and destroy production, to save the world from undying, unending torture from hungryness.