Pathfinder 2013 - Ben's group
Sihedron Force Ring
Produces a 7-pointed star shield
This ring generates a shield-sized (and shield-shaped) wall of force that stays with the ring and can be wielded by the wearer as if it were a heavy shield (+2 AC). This special creation has no armor check penalty or arcane spell failure chance since it is weightless and encumbrance-free. It can be activated and deactivated at will as a free action.
This ring was found hidden in a locked room below Thistletop. After opening the room and defeating the greater barghest that had been imprisoned there, Kordin discovered a small, silver coffer containing the ring.
Its face is a 7-pointed star, or Sihedron rune, suspected to be related to the Runelords. When activated, the shield it produces is also in the shape of a Sihedron.