Shiva has granted him three infallible arrows which had the power to conquer the whole world. Agni god has bestowed him with a bow.
Krishna tells that whichever side Barbari supports will only make the other side weak due to his power. Nobody has the skill or power to defeat him. Hence, he is forced to support the other side that has become weaker due to his word to his mother. Thus, in an actual war, he will keep switching between the two sides, thereby destroying the entire army of both sides and eventually only he survives. Subsequently, none of the side is victorious as he will be the only lone survivor. Hence, Krishna avoids his participation from the war by seeking his head in charity.
As a true Kshatriya, he offered himself to be sacrificed, but he did have a condition. The condition was that he had left his home with a singular desire to witness the epic battle, so could Krishna use some of his divinity to grant him that ability. So it is said that after the sacrifice, Barbareek’s head was installed atop a hilltop from where he witnessed the entire battle and thus he is also referred to as ‘Barbari – the silent witness’.
He is also known as Teen Baandhari and Khatu Shyamji. He is one of the persons who saw Shri Krishna’s vishwaroopa form.