Carriers are the capital ships in the Protoss air force, built at the Stargate with the Fleet Beacon as a prerequisite. Unlike other units, Carriers do not engage the enemy directly. Instead, they launch tiny Interceptors that attack in a swarm around the Carrier. The Carrier is a production facility as well; Carriers are responsible for training additional Interceptors. The Carrier initially warps in with four Interceptors available, and from there it can be ordered to train additional Interceptors (an ability that can be set to autocast) for 15 minerals each. The maximum number of Interceptors that any Carrier can hold at one time is eight.