Hathor was a grandson of Hador, of the House of Hador. He was the youngest son of Galdor and Hareth of the Haladin and the younger brother to Húrin and Huor. He was not supposed to exist, yet a power greater even than that of Eru Ilúvatar made him and even granted him a gift that would help him fight and become the epitome of the term 'warrior'.
I am just getting into the Silmarillion and Tolkien as a whole, so I ask for forgiveness should things be wrong and, if possible, to correct me. English is not my mother tongue, so don't expect Tolkien-level here.
Hathor will be given the 'Essence of the Warrior', which suits the world in my opinion. I ask for input, and I create the story depending on them.