Hero's Handbook

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