- Kirito's black sword's appearance is similar in style to his Dark Repulser in Sword Art Online, which was forged by Lisbeth as well, and shares a color-scheme with Kirito's Elucidator from Sword Art Online.
- Kirito's black sword's blade was described as blue in the novel but was changed to gray in the anime.
- Kirito's black sword was named Unity Vox (ユナイティウォークス, Yunaiti Uōkusu?)[† 1] in Lost Song; however, the author has stated that he has not yet decided on a canon name himself.
- ↑ Localised to Vox Unitas in the official English translation of the game.
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