Warp blades are powerful Nerazim melee weapons.
The origins of the warp blade lie on the xel'naga ship the Nerazim departed Aiur in. Gaining access to new knowledge, the Nerazim used the psi-blade as a template to forge an instrument with which to shape their burgeoning psionic ability, and infuse it with Void energy. Warp blades are more powerful than psi-blades, and react to the user's strength of will, turning centuries of discipline and training into a powerful weapon. Further iterations on its design yielded scythe-like blades, which helped diversify the combat style of the Dark Templar. These shadow scythes are wielded by the Zer'atai and the Nerazim Matriarch Vorazun, while the Lenassa favor "wickedly curved" warp blades.
Warp blades are able to parry psi-blades, and be parried in turn. After the severing of his nerve chords, Artanis demonstrated the ability to wield a warp and psi blade in tandem. According to the Daelaam archives, Praetor Fenix was able to wield warp blades when he used them to slay Nerazim terrorists who had taken over a Conclave tower.
- The single-blade design was originally intended for Zeratul's character only, but due to time constraints, the same unit design was used for all dark templar in StarCraft: Brood War.
- StarCraft II: Legacy of the Void: Reclamation depicts Nerazim using the warp blade prior to their banishment from Aiur, contradicting unit information which states that they only gained access to the technology after leaving the planet.