The Deadly Survivors

SPOILERS AHEAD! Do NOT read if you have not read past book four; The Broken Path. It's best though, if you read book five, The Endless Lake.

You probably have read at LEAST book one of survivors if you're reading this right now, and you also might know about Lucky joining a pack, and so on. But there just HAD to be other packs besides Terrors/Twitch's pack, or Alpha/Sweet's pack.