Fehlauer's Savage Tide
First known to the party as a passenger named Father Feres—but he’s not a priest at all. He’s a common smuggler named Conrad Horst, a man hired by unknown persons to smuggle a letter to Scuttlecove. He delivered the letter but some days later collapsed with convulsions. Quick thinking (and quick surgery) excised an implanted Slaad egg just before it hatched. The party killed the Slaad and Conrad renounced his former occupation.
Conrad stayed behind with the villagers on the Isle of Renkrue (the tribe that cured Zam Ji of his mummy rot) after he too joined the tribe/took a wife. His last words to the party was that he wanted to try being a real priest, to learn the ways of Shamue while teaching (and protecting the villagers from) the ways of civilization.