Karl von Drexler is Himmler's personal mystic and the leader of the Karotechia cell known as the Scions of the Black Sun, operating in North Africa. He is described as a tall, drawn man in his fifties wearing an immaculate desert uniform, with piercing eyes and the presence of a true believer rather than a mere opportunist. Brandt's journal reveals she feared and resented him, speculating on how she might wrest control of Das Ungerhauer from him if necessary.
Drexler's goal at the Oasis of Whispers is ritual appeasement — Hanover observes him kneeling at the pool with his hands in the water, chanting as the surface glows blue-green with bioluminescence. She identifies the ritual from Pendleton's translated notes as an act of appeasement rather than summoning. Haze's plan centred on eliminating Drexler from range to disrupt the ritual, but the chaotic nature of the battle — Das Ungerhauer's emergence, mass temporary insanity, and multiple simultaneous crises — made the engagement far more complex than anticipated. Drexler's fate in the final battle is not confirmed in available records.