So some SAO fans didn't realize who she is... Eydis Synthesis Ten is a reoccurring character throughout the Sword Art Online series and is a supporting character in the Alicization Arc, and is an Integrity Knight and a closed friend of Alice.
Original date post: 17th January 2021 (DeviantArt) and 5th August 2021 (pixiv)
SAO Unleash Blading mobile game opening video & key visual with theme song Gyakkyou Spectrum by ASCA, including footages of game adaptation of Moon Cradle (SAO vol 19-20) & Progressive Aria of A Starless Night movie