The Unknown Circle, more commonly called the X-36 after its design and original sprite number, is not player-flyable and only appears in combat. Prior to the Hidden War, it was simply designated as Unknown. The X-36 is a very nimble opponent capable of hovering on the spot and turning very rapidly, making it dangerous to attack at short range. Do not be alarmed if the X-36 appears to 'shift' sideways without moving forwards or turning; this is the result of it using maneuvers like Sideslip and Barrel Roll when not moving. Raw Arc Data: