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Eldrie Woolsburg (エルドリエ・ウールスブルーグ, Erudorie Ūrusuburūgu?), also known as Eldrie Synthesis Thirty-one (エルドリエ・シンセシス・サーティワン, Erudorie Shinseshisu Sātiwan?), was one of the Integrity Knights in the Alicization Arc.
Eldrie was rather tall and had a thin stature, a stunningly beautiful face with eyebrows that gave off a rugged expression, and long pale purple hair.
As an Integrity Knight, Eldrie wore a suit of polished silver armor with a purple mantle, which had a crest with a cross going through a circle embroidered upon it.
He was trained in the Imperial Knight Order, where his father was a general, and became its representative for the Empire Swordsmanship Tournament, where he defeated Sortiliena Serlut in his first match and Uolo Levanteinn in the second. He later won the Four Empires Unity Tournament and was invited to the Central Cathedral. After he had arrived at the Cathedral, Quinella performed a «Synthesis Ritual» on him. The ritual involved suppressing the memories of his past life via manipulation of his Fluctlight, as well as the use of a «Piety Module», and the creation of a new identity, who was completely loyal to Quinella due to the «Piety Module» that took the form of a purple prism embedded into his forehead.
After Kirito and Eugeo were imprisoned, Alice Synthesis Thirty ordered Eldrie to spend the night in the maze outside the prison, as she anticipated that the prisoners would try to escape. Eldrie himself initially did not believe that this would be possible and intended to admire the rosebuds with a glass of wine, but, to his surprise, the two prisoners actually escaped and came through the maze.
To enjoy himself, Eldrie decided to fight Kirito and Eugeo before returning them to prison. Since Kirito was using a chain as a whip, he decided to use his Frost Scale Whip instead of his sword. He enhanced the whip with the Armament Full Control Art and was able to easily counter Kirito's Sacred Art with his speed chanting.
After a series of struggles, Eldrie's left cheek was cut by Kirito using a fragment of a glass cup that Eldrie had shattered beforehand. As Eugeo attempted to attack him while he was in a stalemate with Kirito, Eldrie was forced to activate his Release Recollection command and thus transformed his whip into a snake, throwing Eugeo to the floor and breaking Kirito's chain.
At this point, Eugeo recalled that Eldrie Woolsburg was the champion of the Four Empires Unity Tournament that took place in the first third of the fourth month. This revelation shocked Eldrie, as he had no memories of his life as Eldrie Woolsburg before becoming an Integrity Knight. As Eldrie began thinking of his past, a purple prism protruded from his forehead, though it began fading away with time. Noticing this, Kirito encouraged Eugeo to trigger more of Eldrie's memories to stop the prism from fading away. However, just as they were making progress, this was interrupted by another Integrity Knight shooting arrows at the prisoners and the prism returned to Eldrie's forehead, while the prisoners escaped.
- In the web version, Eldrie was called "Eldrie Synthesis Twenty-six", instead of "Thirty-one" in the published version.