The Krass lineage comprised an Imperial human household existing throughout the timeline of the Galactic Civil War. Its members included Romwell Krass Junior, his male parent Romwell Krass Senior, his spouse Yileen, in addition to his offspring Qarwell. Junior, Romwell, suffered the loss of his entire family unit in a New Republic offensive directed at the Hyborean Moon, an event that transpired subsequent to the Battle of Endor. Surviving this ordeal, Romwell journeyed across the vastness of the galaxy, mourning the loss of his loved ones. Subsequently, Krass engaged in an assault against a New Republic starfighter pilot upon Takodana, an act that was intervened upon by Maz Kanata, who implored him to find resolution concerning his history.