The unknown group was the famous Nangong Family. One of the three surviving Great Families from the Murim Alliance. The other two were the Murong Family and the Shangguan Family.
The Nangong Family was known for their arrogance, but they were even renowned for their sword technique. The Nangong Family's patriarch was known as the Sword Saint. People compare him with the Sword God, the Murim Alliance Leader.
The current patriarch was Nangong Hao. While they were part of the Murim Alliance, they were rarely involved in the Murim Alliance's affairs. Even when the Murim Alliance was attacked, they didn't get involved much in the war against the Heaven Founder.
That family now visited the Thousand Vows Pavilion, bringing their elite along with the current Sword Saint and the previous Sword Saint. The old man in a white robe was the previous Nangong patriarch, the previous Sword Saint: Nangong Xiang Yu.
