Starkiller Base

The Starkiller Base was a snowy planet, converted by the First Order into a super weapon. Like the Death Star I and II, Starkiller Base was capable of destroying entire planets. However, it is superior to the previous models; it relies on energy harvested from the sun, was more than three times larger than the Death Stars, and can destroy more than one planet at a time, it's first target being the Hosnian System, the seat of the New Republic's Senate.

The Base was destroyed thanks to the efforts of Han Solo, Finn, Rey and the Resistance X-Wing Fleet.

Trivia

 * Starkiller was the last name George Lucas had originally intended to use for Luke and Leia before changing their last name to Skywalker.
 * The name "Starkiller" has also been used for various subjects in the Star Wars universe, including the (now non-canonical) secret apprentice of Darth Vader in The Force Unleashed series of video games.