When deactivated, the seraph blades are dull tubes; once activated, the blade springs to life. They vary in length, from a small ones like daggers, to long ones like swords. The blades have runes cut into the sword that glow beneath the blade's surface.
- There are other weapons, such as bow(s) used by Alec, aside from swords or bladed weapons that also pop out from tubes like seraph blades.
- The design for the blades in the first season was the same as the one used in the preceding film adaptation. The blades used to glow brightly and make high-pitched sounds when used. It was redesigned for the second season.