Phoenix pilots can use the ships inertial drive as a catalyst to channel the warp field that surrounds their craft. The result is a stream of anti-gravitydubbed the Graviton Beamwhich turns the target into a near weightless object, but also forces the Phoenix to remain stationary while its active. The Graviton Beam was originally conceived as a last resort, one the Protoss fleet has come to embrace as an effective control weapon.