The best description I've found about the historical, practical, and logical hell that is ontological monism is provided by Warren Carroll, The Founding of Christendom (Christendom Press, 1985).
In the first chapter, he writes about the Harappan civilization: its doctrine of reincarnation, cult of Thug stranglers, horned gods, and other terrible realities . . . and its destruction by Aryan invaders from the north whose destruction of the Harappan cities was so ferocious, one speculates that the Aryans believed they were "crushing something abominable." p. 31.
In Chapter 7, Carroll returns briefly to India to write about the coming of the Buddha in the sixth century and the terrible culture Siddhartha found. Carroll writes about the "hideous, many-tentacled" metaphysics that strangled Indian culture (and which would continue to strangle until the British Raj in the nineteenth century).
He writes about the Indian metaphysics (out of which Buddhism grew) and its awful conclusion that, creation sucks so much, men should seek moksha: complete annihilation.
Such soul-shattering horror is not natural; it is of Hell. Why early India became Hell's special victim we cannot know. But the immense distorting effect of that Satanic spiritual climate is unmistakable in the Buddha and the Mahavira [despite their noble, generous, and loving traits that parallel Catholic saints]. p. 162.
