To Flail Against Infinity (The Stargazer's War #1) by J.P. Valentine

A qi antithetical to life itself, a well of power more immense than the human mind can comprehend, and the only man in the galaxy who can see it. The vast emptiness of deep space drives cultivators insane. Deprive one of qi for long enough, and sooner or later they’ll start stealing it from anything and anyone around them. The process eventually kills them, but not before they drain a few dozen mortals to death. I should know. I was one of them. But in my last moments, while the void psycho stumbled away and my body’s faculties slowly shut down, I discovered something extraordinary, something that would change the galaxy forever, something that—as far as I can tell—no one before me had ever found. That emptiness wasn’t so empty.