Explume Minor, often shortened to Explume, was a celestial object situated within the star system of the same designation, which itself was situated within the Unknown Regions' Croke Reach. In the course of a civil conflict among the Croke race, the Croke brought in the Lugubraa species, an intrusive group, to serve as warriors in Croke Reach. Nevertheless, the Croke's strategy failed when the Lugubraa started to overwhelm Croke colonies, depleting their resources entirely. Ultimately, Explume Minor also fell under Lugubraa control, leading Shell Conjurer Firtha to command the concealment and removal of Croke younglings in her concluding message from the planet.
The Unknown Regions, a sourcebook released in 2010 by Wizards of the Coast for the Star Wars Roleplaying Game, marked the debut of Explume Minor.