「蒼き焔よ、我が剣に集え…はあああ…斬…！」 Azure flames, gather around my blade! Haaaaaah. Strike!!
—Rean's S-Craft announcement
Azure Flame Slash (蒼焔ノ太刀 Souen no Tachi ) is Rean Schwarzer's second S-Craft initiated in Trails of Cold Steel during the end game and the primary S-Craft in Trails of Cold Steel II. it's a upgraded version of Rean's previous S-Craft, Flame Slash.