DMM’s popular web game and mobile game Touken Ranbu（刀剣乱舞）is going to make an existing character to be available for further upgrade. The status of the sword after the upgrade is Kiwame（極）.
【極(きわめ)】
極の姿となった刀剣男士の情報を新たに入手しました！本日、先行してビジュアルのシルエットを公開いたします！ゲーム実装時期等の詳細は今しばらくお待ちください△△ #刀剣乱舞 #とうらぶ pic.twitter.com/2p1wHELLq5— 刀剣乱舞-本丸通信-【公式】 (@tkrb_ht) February 14, 2017
According to the tweet above, the date available and other details are yet to be confirmed. Japanese netizens have suggested the possibility of the silhouette being Hakata Toushirou（博多藤四郎）.
