Arbiter

The Arbiter-class starship is a Protoss unit in the fictional StarCraft universe. It is an aerial unit that is primarily a specialized support unit, and it incapable to standing up to enemy ground or air units of the equivalent cost. In the storyline, they are piloted by ones of the Judicator caste, the one of the three castes in the highly complex Protoss civilization that govern the warrior and worker castes. It serves as a focusing point for the psychic Judicator pilot to finely focus psi energy to warp reality and the spacetime continuum around the starship, effectively making nearby units invisible. This cloaking field is used automatically and does not deplete the starship of any energy at all.