Amgoich asked A.J. Smith:

Dear Mr. Smith. I enjoyed "The Black Guard" immensely. I wonder where I can get more information about the different churches of the one god? Some background, or description of their different roles? Thank you.

A.J. Smith Thanks for reading, glad you enjoyed it.
More information is given about the clerics in the sequels, but in the meantime...
White - church of purity, peace and healing
Gold - church of wealth, greed and gluttony
Black - church of death
Blue - church of knowledge, wisdom and teaching
Purple - church of nobility
Red - church of war, strength and conquest

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