Amulet of Intervention

This amulet takes the shape of a large golden square. It has red and green gems inlaid on one side and engraved with the image of a pair of wings on the other side. When worn, it protects you from disaster and wards away death.

Guardian Angel. If you would be subjected to an effect that would reduce you to 0 hit points, the amulet automatically activates. A golden sphere of light bursts forth, negating the damage dealt and rendering you immune to all damage and all conditions. This sphere lasts for up to 1 round before fading away. Once this ability is activated, the amulet loses its magic until the next dawn.