Madhvacharya was fiercest critic of Advaita Vedanta, accusing Shankara and Advaitins for example, as deceitful demons teaching Buddhism under the cover of Vedanta. Advaita's nondualism asserts that Atman (soul) and Brahman are blissful and identical, unchanging transcendent Reality, there is interconnected oneness of all souls and Brahman, and there are no pluralities. Madhva in contrast asserts that Atman (soul) and Brahman are different, only Vishnu is the Lord (Brahman), individual souls are also different and depend on Vishnu, and there are pluralities. Madhva criticized Advaita as being a version of Mahayana Buddhism, which he regarded as nihilistic. Of all schools, Madhva focussed his criticism on Advaita most, and he wrote four major texts, including Upadhikhandana and Tattvadyota, primarily dedicated to criticizing Advaita.