The Eye of Onyx is an animus-touched object that is part of the SandWing Treasure, described as being a black cabochon accented with dragon wings made from molded, beaten, gold that was red-gold-orange in color on either side (thought by Sunny to resemble the "Wings of Fire" from the dragonet prophecy), and set on a chain of hammered golden links. The sphere is most likely made of onyx, (hence its name, the "Eye of Onyx").
Whoever holds the Eye of Onyx rules the Kingdom of Sand, provided that the last SandWing queen is dead. Therefore, if Princess Blaze, Princess Blister, or Princess Burn were to have the Eye they would have become queen, stopping the war, as Sunny did in The Brightest Night. Sunny had given it to her mother, Thorn, the leader of the Scorpion Den and the Outclaws. Afterwards, Blister attempted to steal it, resulting in her death: Since the current queen hadn't either died or given Blister the Eye of Onyx willingly, she was electrocuted and reduced to nothing but a pile of black dust. Thorn is the current owner of the Eye of Onyx.
- It is highly theorized that the Eye of Onyx was created by the SandWings' only known animus, Jerboa. However, this is not yet confirmed.
- A dragon who is unworthy of being queen of the SandWings will be electrocuted and exploded into a pile of dust (like Blister), while one who is worthy may hold and wear it safely.
- The Eye was thought by Sunny to be what the false prophecy meant by "If she bows to a fate that is stronger and higher, she'll have the power of Wings of Fire", given the golden wings on either side of it.
- Onyx is a type of black gemstone, although it can have other pigments.
- Oasis most likely didn't wear the necklace, due to the fact that is might have accidentally killed a dragon unworthy of being Queen.