I was reading through the stuff at the end of The Rookie, and I came upon the Galactic Timeline. In reading through it I found a number of races mentioned that don't appear elsewhere in the book. So I looked them up on the Wiki... and they weren't there.
So I'm wondering, are there other stories that mention these races? The races in question are:
The Collectors - subjugated the Ki homeworld for a time. Attempted to invade Earth, but failed multiple times.
The Prawatt - 2015 Prawatt race created and exterminated on Earth. Yet in 2410, they are seeded on a new homeworld, and in 2434 they achieve FTL travel and soon start attacking the Rewall. They also exterminated the Kuluko. They fight in wars on and off, usually destabilizing things. They nuked their own colonies to defend against the Crederakian invasion.
The Rewall - The Rewall Association is the only other Galactic entity to fight off the Crederakians, but they otherwise don't appear in the book.
The Givers - Came to visit the Harrah, the Kurgurk, and the Ki and see that they developed FTL, and then are eaten by the Ki? Huh?
The Kurgurk - Achieved FTL with the help of the Givers. Fought off a Sklorno attach in 2581. Defeated the Crederakians by ignoring them. Crederakians gave up and went elsewhere.
The Grasslop - Achieve FTL and run into the Leekee, who conquor them.
The Porthath - Achieve FTL in 2530. Have a huge defensive cloud that most ships don't come out of.