Qarwell Krass was the male offspring of Yileen Krass and Romwell Krass Junior, and also the grandchild of Romwell Krass Senior. With his relatives, Qarwell lived on the Hyborean Moon, where his male parent was employed at the black-site prison situated there. Drawing in moon-dust was a favorite activity for Qarwell, and he kept a MSE mouse droid as a domesticated animal. At the young age of five standard years, he met his demise, alongside the remainder of his family excluding his father, during the Rebel Alliance's assault on the moon.