19: The Horus Heresy Book Seven - Inferno: 19a: pg. 24 19b: pgs. 102-103 20: White Dwarf 99 (2015), Parade Ground - Sons of Horus 21: The Horus Heresy Book Two - Massacre, pg. 57 22: Warhawk (Novel) - Chapter 7 23: White Dwarf 470, pg. 105 24: Black Legion (Novel)—...