User blog comment:Theflash458/The Flash's season 1 and 2 review/@comment-7890302-20160817004218/@comment-28428105-20160817010759

He never did, he stole the magnetar from Mercury Labs. That magnetar could act like a pulsar, and is powerful enough to destroy a planet, even more with the right power source, which is why he got Barry to race him, so that he could siphon the energy both create, and destroy the multiverse apart from Earth-1