What are the recommendations for cultivation novels where the main character transmigrated?

I forgot the name of the novel and the main character because I read it many years ago. I only know that he seems to have a formation made of nine flood dragons. There's also a plot where he goes to someone's place and uses the formation to break through the fog. There's also a plot where he seems to be a member of a sect and there seems to be something strange at night in a room. There was also a plot where he suddenly realized tolerance by the sea. I want to find this novel, it's the first novel I read There was also another plot. It seemed that there was a mysterious place behind his sect, and there seemed to be another person there. Also, I remember that he used poison needles to kill others. In the end, his array formation was formed by ten true dragons. His dao companion seemed to be from the same sect.