Adria's necklace

Charm containing a piece of the holy city of Celestis, worn on a necklace by Adria. Functioning much like an Ancient personal shield emitter, the necklace prevents the Orici from being harmed. All forms of weapons, be they energy or projectile, cannot pass through the protective shield that emerges to encase her.

The necklace even protects Adria from threats such as the Dakara super-weapon, leaving her biologically intact while those around her are eliminated. While in the presence of a great dampening field (such as one installed by Morgan Le Fay on Osric's planet), the charm continues to function even if Adria's Ori abilities are blocked.

KEY EPISODES

Counterstrike Adria's necklace protects her from the Free Jaffa Nation's attempt to wipe out an Ori threat with the Dakara super-weapon.
The Quest, Part 1 - Adria's necklace still operates in the presence of Morgan Le Fay's dampening field, preventing Colonel Mitchell from killing her with his P-90.