So, after his weapon breaks and he starts cultivating some new power. It’s been a long while so it won’t be anywhere near the current chapters.
http://gravitytales.com/novel/chaotic-sword-god/csg-chapter-374 Should be around there. You already know he's cultivating a new system so that chapter is start of said system. Eventually it evolves into cultivating chaos force hence the name of the novel: "Chaotic Sword God".