The Xen'drik Expeditions comprised an RPGA living-campaign organized play event from 2006 - 2007.
Characters were required to be a member of one of four factions (Blackwheel Company, Cabal of Shadows, Crimson Codex, or Covenant of Light) which restricted and/or granted some build parameters and some play options.
The general "Expeditions Campaign" adventures were open to characters of any faction. The four groups of "Faction" adventures were open only to members of the related faction.
In addition, "DM's Mark Adventures" allowed individual Dungeon Masters to craft (or modify) and play adventures with their local group at an RPGA-sanctioned event.
A variety of supporting materials also were published, including journals and pre-generated characters for each faction.