They were none other than the three Virtues chasing Vexa and Radur who had fled after the death of the two other Virtues in charge of protecting the Schwazen capital. Mirror Vanguard had been unable to find them despite the active collaboration of Caphriel and the Schwazens loyal to Aurae.
Xi never expected to meet them here, in the eye of the storm.
[How did they get here undetected?] She wondered, all sorts of unanswered questions bubbling up in her mind. [Could they have been lurking until now by moving through the Mana Storm?]
It was unlikely, but after witnessing Digestor Ruby's adaptive abilities firsthand, she didn't find it so hard to believe. These Corrupted Virtues could definitely adapt to the Mana Storm if given enough time. If they knew from the start what its nature and composition was, then it was entirely possible for them to prepare in advance.