Eighth day Prayers for Navratri is dedicated to Goddess Mahagauri Navratri Day 8 Mantra in Hindi is given below. It is chanted on October 21, 2015 during Navratri. There are three mantras. First is Mool Mantra for eighth day of Navaratri. Second is Dhyan Shloka dedicated to Goddess Mahagauri. Third is a Stotra. You can chant also prayers like Lalita Sahasranama on the day.
There is no need to chant all mantras. Most devotees chant just the mool mantra.
Navratri Day 8 Mool Mantra
Navratri Day 8 Dhyan Mantra