Master Dungeon Guide

The Master Dungeon Guide is an item you carry around in your inventory. Completing dungeons will add an entry to the Guide. It is unknown what the reward is for turning in a completed Guide to Tyr the Skaald (Norn), Kodan (Deldrimor), or Gedrel of Ascalon (Ebon Vanguard).
 * Note, completing dungeons without the Guide in your inventory (e.g. during the sneak peek weekend) will not add them to the Guide.