|“||Glaive imbued with thunder spirit. Utilizes lightning power.||”|
— In-game description
Thunder Edge takes up the appearance of a large double-edged tsurugi. The total length of the Divine Instrument is slightly longer than Amaterasu's body length, starting at the point above her nose and ending past the point where her spine trails into her tail. The entire weapon is made of a shining golden alloy, divided into eight sections: the blade, the hilt, and six spikes arranged arranged to have three on each side of the blade's edge; these parts together form a circular guard with the six spikes constantly separating and moving outward and retracting, while the blade and hilt remained motionless in respective to each other, floating and positioned as if they are one single piece, in contrast to the other six spikes. The blade itself is the single largest section: a long straight blade, medium-sized in width (not slender like a katana's, nor broad like the Eighth Wonder's) with double edges. The blade possesses few engraving: a simple long grove that runs from two-third the length of the blade (from the tip) to the edge of the circular guard, at which the engraving extends sidewards to form part of the circular engraving on the guard itself. The hilt has more intricate decorations, consisting of a grove running along the piece that extends into one part of the circular guard, and a small flat cyclindrical knob for the pommel. The parts bearing the more intricate decorations are the spikes; each has an engraving that is a grove pointed down the spike's tip, with the grove's bottom also extending to form the engraving on the circular guard. As a whole, Thunder Edge is a Divine Instrument in the form of a broadsword with an outward radiating motif for the guard, in the center of which holds a small thundercloud that constantly generates lightning, which in turn arcs outside through the guard's design and movements.
- Thunder Edge resembles Tsumugari, the Glaive obtained from True Orochi's present-day counterpart, Orochi; it is also similar to the Kusanagi, obtained from the defeat of Yamata-no-Orochi at Susanoo's hands in Shinto mythology. This reflects the relationship betwen the Tsumugari, Blade of Kusanagi and Thunder Edge, which are all based on the same sword (Ame no Murakumo no Tsurugi, more popularly known as the Kusanagi no Tsurugi).
- It, like Solar Flare and Tundra Beads will not carry over into a new save file and can only be obtained when True Orochi is defeated in the Spirit Gate.
- Thunder Edge resembles Alastor, a sword from another Capcom game, Devil May Cry. Both Thunder Edge and Alastor are lightning swords, and Thunder Edge's Sub-Glaive lunge attack is very similar to Alastor's Stinger attack, in which Dante plunges the blade into enemies with lightning speed.