The Krillitanes were able to take the abilities from other species, giving them new appearances and qualities. Unable to shape-shift, they could create morphic illusions, keeping them cloaked in human form. Their wings were capable of lifting heavy things. When the Doctor first encountered them, the Krillitanes looked like humans with very long necks. (TV: School Reunion) In 2007, Brother Lassar became completely human. (TV: School Reunion)