What is the name of the First Order’s planet-killing superweapon?

The story behind the answer

It’s the First Order’s superweapon in The Force Awakens: a planet refitted to siphon a star’s energy and fire a hyperspace-range beam that wipes out entire star systems. By contrast, Death Star II was the Empire’s second moon-sized battle station destroyed at Endor; Sun Crusher and World Devastators are Legends-only—the former a tiny near-indestructible ship with resonance torpedoes, the latter factory-dreadnoughts that strip-mine worlds rather than unleash system-spanning blasts.

Built as an escalation of Imperial doomsday tech, it annihilated the Hosnian system, announcing the First Order’s power. Its star-draining mechanism introduced a fatal flaw: once the captive star was spent, the base destabilized—letting the Resistance exploit its thermal oscillator and trigger its destruction.