The "Dark Nest Crisis" is a storyline in the expanded universe of the Star Wars franchise, specifically within the New Jedi Order series. It revolves around the emergence of a new threat from the Dark Nest, a mysterious group of Force-sensitive beings known as the Killiks. These creatures have a hive-like mentality and seek to expand their influence, leading to conflict with the Jedi and the New Republic. The crisis begins when the Killiks start to invade and assimilate other species, causing fear and chaos. The Jedi, led by characters like Luke Skywalker and Leia Organa, must navigate complex alliances and confront the dark side of the Force to restore peace. The storyline explores themes of unity, identity, and the consequences of power.