The Walking Dead: Everything You Need To Know About The Whisperers
2. The Whisperer War
As you can imagine, putting the heads of several members of Alexandria, Hilltop, the Kingdom etc didn't sit too well with Rick and his fellow survivors, which eventually led to a full-blown conflict with the group known as The Whisperer War.
There's a lengthy build-up to this, which involves a lot of conflict and tension between Rick and Alpha, with Negan also playing a key part as he seemingly flirts with the idea of going over to the Whisperers before slitting Alpha's throat and decapitating her, essentially achieving his redemption as he takes her head back to Rick.
That leads to Beta swearing revenge on the communities, and a conflict between the Whisperers and the militia of the other survivors, with the former utilising a massive herd of walkers to their advantage. Of course, given how the show botched All Out War, there's reason to be wary of another major battle, but the fact this involves a herd of walkers and a group unlike any other should mean it plays out differently to that maligned storyline.