The End of the Viper's Tail is an adventure module by Shawn Merwin set in the Eberron campaign setting using the 3.5-edition Dungeons & Dragons rules and designed for the RPGA's Crimson Codex Faction Adventure as part of the overall Xen'drik Expeditions campaign. It was released in 2008. It is optimized for four or five 13th-level characters but can be played by four or five 11th-16th level characters.
Summary[]
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The draconic Prophecy says that all things come full circle. All of the Codex's expertise, knowledge, and talent—and the help of friends new and old—will be needed in the face of impending destruction. But will any of it matter with the larger threat that sweeps toward Stormreach like a tidal wave? A Xen'drik Expeditions Crimson Codex faction adventure for characters level 11-16
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— Front page blurb