You would have thought that, after two failed attempts at making a planet-sized weapon, they wouldn’t make another but it looks like the new bad guys - the First Order - have designed a new killer planet, this time called the Starkiller base.
Unlike the Death Star, however, this isn’t a mechanical planet: it’s an ice-planet turned into the First Order’s stronghold. According to the Star Wars data bank, it has a “fiercely destructive new weapon capable of destroying entire star systems”.