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 Sundrop 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 Sundrop Flower, its powers can be activated only by singing the Reverse Incantation. As such, it is 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. If Cassandra wishes to use its power, however, she needs to tap into her rage in order to awaken the opal's power and connection to the black rocks it creates.
- 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 left side of her chest over her heart.
- The Moonstone Opal's title, blue color and its unique connection with the moon, is a bit similar to the fragile Moonstone and its shattered shards from Tinker Bell and the Lost Treasure.