A fantasy novel where the protagonist uses a knife

There were many fantasy novels where the main character used a saber, such as Battle Through the Heavens, Martial Universe, and Master. These novels usually depicted the protagonist in a mysterious world who became a powerful martial artist through cultivation and combat. In the process of cultivation, the protagonist would continue to learn and master various skills and weapons, and eventually become a strong person who could take charge of a certain area. In novels where the protagonist used a knife, there were often some mysterious weapons and skills such as Ice Spirit Silver Needle, Flame Demon Slash, Demon Disintegration, and so on. These weapons and skills could help the protagonist win in battle and also help the protagonist increase his strength and level. In fantasy novels where the main character used a sword, it usually involved some powerful enemies and challenges. The main character needed to constantly fight and cultivate in order to continuously improve his strength and finally become a true expert.