Five items, the a ring, a crown, a staff, an orb and a dagger. These five items are needed to unlock the Sovereign Gate that controls the time loop. The lich has one, the crown, and the dagger is held by the treasury of the king of Eldemar. The orb is located in Koth. Zorian can cast a spell to find them if he is close by. They appear to powerful magical items and each have different abilities that appear to be designed to help with the "time loop".