Blood for the Serpent King (2017 Convention Module), softback adventure for Dungeon Crawl Classics, by Edgar Johnson
“Deep in the jungles, amidst the ruins of an unimaginably ancient civilization, dangers lurk: feral tribes and predatory beasts, and darker things that civilized folk prefer to forget. You’ve heard rumors of the treasure hordes of one of those great evils: the legendary serpent-man, Xiuhcoatl. They say that Xiucoatl is worshipped by feral tribes of degenerate serpent-men who call him The Emerald Cobra. Do you dare face their rites of blood and sacrifice?”
This was the DCC 2017 Convention Module, not generally available at retail.