Sailor Quartet

The Sailor Quartet is a group of characters from Pretty Guardian Sailor Moon that are featured in The Knights of the Multiverse, introduced in Season 3. Consisting of members Sailor Vesta, Sailor Juno, Sailor Pallas & Sailor Ceres, they were corrupted by Black Lady to serve in her Guild of the Multiverse until they were freed by the Crystal Knights, revealing themselves to be serve as Neo Sailor Moon's main protectors in the future.

Pre-Series
The quartet of sisters Vesta, Juno, Pallas & Ceres were born in the future of Crystal Tokyo. Unbeknownst to them though, they were intended to become the next generation of Sailor Guardains, getting their power to protect their Kingdom's new princess, Usagi "Small Lady" Tsukino, when she finally came to power. She and the others were still normal civilians, though the four picked up skills in various performing arts, such as Vesta developing an affection for animals and fire tricks, Juno a knack for acrobatics, Pallas skills with ball balancing and other aerobics, and Ceres with trapeze balancing and flower-related tricks. However, this was when Black Lady sensed their power, and used her dark power to corrupt the four soon-to-be Sailor Guardians, and they became the Amazoness Quartet.