"7 mystical orbs that summon the dragon Shenron, who can grant any wish. Or almost any wish. Including bringing people back from the dead." Trunks replied, having taken some time to eat as well. "They're created by Namekians, and when Piccolo died in my time, the dragon balls became useless. They also do require a recharge time of about a year, and you have to find them as they scatter across the globe once they've been used."