For the armor, see Red-Black Twin Blades (Armor).
The Red-Black Twin Blades are a pair of swords, one being black, and the other being red. The grips of both swords feature what appears to be metal wrapped in a helix, while the pommels are oblate spheres. From there on up, the swords are very unique compared to Erza's array of other weapons, with the blades not being separated from the grips by quillons or anything similar; the guards are part of the blade, and are also metallic and extremely sharp, curving upward on either side of the double-edged swords so as to not protect the wielder's hands but to, interestingly, protect the ricasso. These would-be guards are also ornate, featuring hamons, and a large gem in the center, which appear to be black on both blades and present on either side. Above said gems are checker-patterned designs, also present on either side of the guard.
- Fairy Tail Manga: Chapter 515, Page 20
- Fairy Tail Manga: Chapter 516, Page 14