Eternal Sun Peak

In the meantime, while the Celestials are being tested by the two Paragons, one of the "slaves" working in another cavern looks in their direction.

Because the Paragons and the ten Celestial Beings were far away, there should be no way for her to see what was happening but her gaze looks as if she could even hear the conversation between the Paragons and the Celestials.

Furthermore, unlike the other Celestial Slaves that are working in an almost animated manner, she's the only Celestial that seems to have full control of her consciousness… She appears to be in her twenties and she has long black hair and blue eyes.

If Vincent was here, he would certainly recognize that she's Tara, the Number 999 Celestial and his first companion! However, the number on her shoulder seems to have been missing so she can be mistaken to be an Unnumbered Celestial.