Ego is the notion of "I" which is in all humans, the false self, although I am unsure exactly what Zarathustra would have called it. It is that which must be burned for the divine light to shine. You have utterly missed my point, however, because you have insisted on pushing Zarathushtrianism further. I tell you no form matters, it is the state they are expressing which we must understand. The form is dead, as all form is transient, if Ahura Mazda is the non-transient then again we are discussing the same as Brahman, Dharmakaya, the Holy Spirit et al... names are human convention, truth is beyond that. Seek truth, do not cling to your notions.