Phase Dragons are enigmatic Rahi which love speed. They used to chase airships and vehicles speeding along the Le-Metru test track, as well as other Rahi. When the Visorak invaded Metru Nui, the Phase Dragons began to chase anything that moved; sometimes they charged to get something to run and would accidentally cause harm. Following the Battle of Bara Magna and the collapse of the Great Spirit Robot, the Phase Dragons later left the Matoran Universe to begin new lives on Spherus Magna.