The Master of the Blood Sword Group had become famed and known for his extremely powerful body and his skill in swordsmanship, but it was also common knowledge how he came to be so powerful.
Growing up with a frail body, his one dream was to one day have an invincible and powerful body, and he truly managed to get close to his dream.
Despite only being an External Cultivator that has only tempered his body, he can rival even high-level Mortal Kings even though he is only a mid-level Mortal King, and that is without the use of his swordsmanship.
His body despite being frail was very well suited to tempering using Evil Energy and specifically the Blood Body Tempering Art that was supposedly granted to him by an elder of the Blood Moon Sect.
Because of that, not only did his power deter most from being enemies with him, but also his backing and the support of the Blood Moon Sect that he may have.