Psionic blade

Psionic Blades (occassionly referred to as psi blades) are manifestations of Protoss psionic energy, serving as the primary melee weapons of Zealots, chanelled through the forearms of their Power Suits. Psionic Blades appear as blue-white light.

Although Psionic Blades are made manifest through psionic powers, it is possible that they rely on a conventional power source as well. Whatever the case, psi blades cannot run indefinetly.