Passive: Aurelion Sol builds up increasing movement speed as he travels continuously in the same direction, and loses speed on sharp turns. Some of this speed is stored away as Escape Velocity stacks, which are lost entirely whenever he takes damage from an enemy.
Active: Once Aurelion Sol maxes his Escape Velocity stacks, he can activate Comet of Legend to pull in his orbiting stars and take flight, traversing over terrain for a long distance. He cannot turn once his course is set, and enemy damage will bring Aurelion Sol back to earth, restoring his orbiting stars.