Mankind rose to the sky. They were the first to overcome the speed of light. They wandered into the galaxy in hopes of meeting other races, to no avail. They arrived way too early, instead of finding worlds bustling with life, desolated planets awaited them. In order to help the races that might be born in the future, they created caches, in which they sealed their wisdom. Millions of years later something has happened to them. They were gone, but their efforts paid off. Now, a new story is about to unfold in this galaxy, in which humans were no more. I also publish this story on royalroad. https://www.royalroad.com/fiction/47067/boundless-galaxy