Vortex: Deadly Master of Air is an Event-only MOAB-Class Bloon found in the Vortex event in Bloons Monkey City. It has a boss health bar which increase every time it levels up after you complete a level of the event. Upon popping Vortex, you will see Vortex saying "You win... this time!" and receive the relative tier of CT Milestone worth in rewards. If you fail to pop Vortex, you will receive a message with the normal "DEFEAT!" showing, and text that says: "...But the Boss is damaged. Chase it down and try again!" Like Bloonarius, the Bloon Beacon is needed to summon the boss out of hiding.