Pretty sure this is about the "Red Rite" described by Chaos Magick author Peter J. Carroll, wherein an aged/ailing mage takes a healthy young lover, conceives a child with her, provides for support of the mother and child's material and educational needs (both mundane and esoteric), and before the child is born performs a death ritual with the intent of reincarnating into his own child to continue the Great Work.
Pretty sure this is about the "Red Rite" described by Chaos Magick author Peter J. Carroll, wherein an aged/ailing mage takes a healthy young lover, conceives a child with her, provides for support of the mother and child's material and educational needs (both mundane and esoteric), and before the child is born performs a death ritual with the intent of reincarnating into his own child to continue the Great Work.