Interrogator Sand is one of the Haegum's most senior officers, having served on Tancred's staff for quite some time now. Sand sometimes teaches for the Haegum medicae staff or scrubs in when he finds interrogation or repair work 'interesting'. Other times he's personally leading major (often experimental) surgeries, conducting interrogations, or overseeing complicated autopsies.

Sand's moment of supreme glory was his work installing Boulvar's brain and central nervous system into his new mechanical body – his paper on the procedure is said to have made it all the way to Holy Terra and senior Officio Medicale executives. Indeed, when he is not doing work for Tancred or hanging out in the Haegum, Sand's public image is that of a senior Medicae in the employ of the Officio Medicale. He is something of a celebrity in those circles, some of his writings on neural grafting circulating far beyond the borders of Calixis space.

Sand is a middle-aged man of medium height and build. He sports a small well-trimmed beard and heir that is both graying and thinning. He comes across as somewhat superior and aloof, which is no surprise since he is a elderly gentleman, a master of his trade, and a senior Interrogator with the Inquisition. Although he is no fighter as such Sand has received extensive combat training and seen enough blood and horror to make him coldly calculating when in a tight spot.