Narasimha is the fourth avatar of Lord Vishnu.
Narisimha kavacha or Narasimha maha mantra is one of the most powerful and revered mantras in the Vedic tradition. This mantra, glorifying the incarnation of God in the form of a lion-man, was composed in ancient times by a devotee of Lord Vishnu named Prahlad. The Vedas state that by repeating the Narisimha mantra one quickly attains the realization of God. In addition, the Narisimha mantra is the best protective mantra that helps a person in any dangerous and extreme situations.
In the presence of the sun, there can be no question of darkness. Similarly, there can be no danger in the presence of the Supreme Lord. When one takes shelter of Lord Narasimha, known as Death incarnate of Death, one becomes completely fearless.
Mantra and its translation
Ugram viram maha-vishnum
Jvalantam sarvato mukham
Nrisimham bhishanam bhadram
Mrityur mrityum namamy aham
I revere Narisimha, the awesome form of the great Maha-Vishnu
He blazes with fire from all sides
He is great, auspicious, and is the death of death itself
Terrible, warlike and Great Vishnu
A face that burns in all directions
Leo man, angry and blissful
Death death I worship