The Moonstone Opal is a supremely powerful, ancient opal gem that had descended to Earth from a single drop of pure moonlight, thousands of years ago, along with its heavenly counterpart of healing and light: the golden Sun-Drop Flower.
Its destructive powers cause death, ruin, decay, disintegration, nothingness, and destruction to those around it, enough to render an entire kingdom uninhabitable and devastated. As with the mystical yellow Sun-Drop Flower, its powers can be activated only by singing the decaying incantation. As such it's the embodiment of death-force itself.
In an unexpected twist, the Opal has allowed itself to merge with Cassandra's entire body; resting on the upper center of her chest, glowing a light shade of moonlight blue.
- Since it had descended onto Earth, it had never been coveted by any mortal until centuries later...by none other than a vengeful, power-mad Cassandra. As such, it resided safely within an ancient chamber designed to withstand its immense heavenly powers of death and darkness. It is now one with the former loyal, once devoted handmaiden; being embedded on the right side of her chest.
- The Moonstone Opal's title, blue color and its unique connection with the moon, is a bit similar to the fragile Moonstone from Tinker Bell and the Lost Treasure.