You need to change a little the sinopsys as it gives the impression that he killed all the immortals with him in the explosion and in chapter 1 he was the only one who died. Makes the chapter a little anticlimatic. He was like, I will kill all of you with me, and then it was just him who died.
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LIKEYeah I know, it is because of this that I didn't use this point in the evaluation, but this aspect can be a big factor in the story. Like, for example, if he had killed all the immortals with him, in the future this kind of plot point could give introduction to a very different world backround. — because all immortals died, the way to cultivate to higher realms was lost and in the place of the battle there are constant wars between sects to try to discover the remains of the past immortals and their hiratage. In the case that they lived, they could continue to pursue the treasure and when the mc gets it and they discover it, they all would be after him.
Yea, please don't give spoilers, this was only me trying to give an explanation of possible continuations based on the synopsis. Apart from this, both of your books, even with few chapters, look promissing. The writting quality is pretty good (I found very few errors, the most just some words with a missing or switched letter which is pretty common when using keyboard) and the world building is shaping up well.