In Lightning the Argent, Sol Badguy confiscated the Thunderseal from Ky to stop him from interfering with his activities.
When Ky Kiske rose in rank to the leader of the Sacred Order of Holy Knights, the Thunderseal was given to him by Kliff as a recognition to his rise to leadership and skill in lightning magic. In Guilty Gear - Strive- the sword retains a similar design to its appearance in G uilty Gear Xrd Rev2, but now sporting a cross shaped handguard that covers more of the blue core. In In Dizzy's arcade mode in Guilty Gear Xrd Rev2 the sword returns in it's regenerated state, without the Thunderseal's large round handguard & uniquely shaped pommel, showing a blue glowing core under the old handguard. In Guilty Gear, Guilty Gear X & Guilty Gear XX the Thunderseal appears as a thin bladed sword, almost akin to a bulky rapier, with a blue-two-sided bulky handguard, blue-grip and a blue-pronged pommel. Thunderseal is Ky Kiske's signature weapon, designed to amplify lightning magic and one of the eight Sacred Treasures that originally formed The Outrage.
