Czarnia was Lobo's home planet.
History
All the Czarnians were killed by Lobo as part of his "science project", and later gave himself an A. Even years later, he would compare his feelings at slaughtering large quantities of opponents with the "fragging" of his own planet. This would also have repercussions in his later life, as he became a target for Preserver, who wanted the "last Czarian" for his zoo.