Preacher Rayos already had enough of a following in his community at Left Luck Outpost when the colossus rose outside Wyllin's Gulch. He took his flock from their home to the Gulch to get the word out, and now times are apocalyptic enough that people are eager for a spiritual leader. The flock grows more popular with each passing day.
What Rayos preaches: the story of Kudamat, the danger of the god's charged essentia, and above all the importance of finding the soul shards before the god siphons them.
Source · Drylands History