She’s apathetic, naïve, and indifferent to others’ plight. Calculating, possesses great influence, a capable leader on par with Selene. Values power, thrives on spreading fear, wars, and bloodshed. Became a part of Chaos, entity rather than human, and no longer is able to turn back. Signifies and brings out the worst in humans, whether nightmares, behavior, or both
At the time of Sailor Wars, Metaria, then known as Beryl, worked within the Golden Kingdom as priestess of Elysian. Like the advisors of Lunarian Kingdom, Metaria was Helios’s counterpart, and where he was looking out for the best of the kingdom on the open, she was the one who worked in secret for the same goal. Wielding the power equal to his, she supported Lunarians when they declared Erisians’ method of curing the illness spreading throughout the Sol as inhumane and for a while, that made the Golden Kingdom allies of the Silver Alliance.
That peace wasn’t about to last. The Golden Kingdom, the last one to join the Silver Alliance, was often unstable politically and militarily. In the state of near-constant warfare, its members tended to fight among themselves more than they tended to stay united against the common threat, and despite Beryl’s and Helios’s attempts to broker peace, the royal family and the generals who were their primary supporters were no exceptions to the rule. Though the two priests repeatedly appealed to the Moon for mutual aid during the crisis, Selene chose to remain at the sidelines of this conflict.
What none anticipated was that Selene’s inaction in this regard would cause the Golden Kingdom to side with Eris. In part, the choices of the Earthlings themselves were to blame. In part, Beryl’s run-in with a hooded stranger who offered her a chance to save those of Earth from the sickness that by that point started to spread into the Golden Kingdom, as well. She did not anticipate that the stranger was a personification of Chaos, nor did she anticipate that she would be caught in the Chaos’s net where her entire being would be twisted beyond recognition. Having had her true heart taken and with the powers she already possessing multiplied by Chaos’s influence, Beryl became more than human.
The being Metaria emerged as both the leader of the Earthlings as more and more of them fell under her control and the main agitator of the attack on the Moon Kingdom, which would result in Selene’s death and Serenity’s ascendance.
Just before the Silver Millenium ended, Metaria was sealed by Princess Serenity in the heart of Saturn. Overtime, the seal weakened, and rebirth of the Silver Alliance members from the past triggered the weakening of the seal created by the Silver Crystal in tandem with Sailor Saturn’s final strike.
Escaping from her prison, Metaria was drawn to Earth and is now lurking on Angel Island in San Francisco Bay. She and those she touched are looking for their enemies, those of the Silver Alliance, with intent to either bring them to their side or destroy them by taking their energy and preventing them from awakening. Metaria’s goal is to complete the Earthling revolt started during the last years of the Golden Kingdom’s existence that took the lives of the Prince and his Generals and weakened Helios.
Talisman: the Golden Crystal. Initially belonging to Helios and Earth’s royal line, Metaria discovered the Golden Crystal after it was lost to the ages during the destruction of the Golden Kingdom and took it for her own. With the Crystal in her power, Elysian is opened to Metaria’s increasing influence, turning the already unstable landscape of dreams into that of nightmares that negatively affects humanity as nightmares lead to lack of sleep and shorter tempers, among other negative influences.