In World of Warcraft Classic, there can be a lot of traffic that makes a game feel like it’s running in the mud, and it can be difficult to play if there are too many characters in the same place. To make this process easier, Blizzard has created a feature called layering, which basically places characters that are in the same area in different cases.
Players in the same layer can see other players in this layer as well, but they cannot see anyone, not in this layer. If you are trying to group with the same players, you want to play on the same layer. It’s similar to sharding. Blizzard made details that they planned to introduce only for the first weeks of the World of Warcraft Classic.
All you have to do to change the layer of your World of Warcraft Classic game is group it with someone on another layer. It could be someone you’re trying to meet, or someone from the guild. Group with them, and if you’re on separate layers, you’ll be transferred to the group leader tier, which will take you both to the same instance.
If you want to use layering for farm mobs on a task, you can kill them in your layer and then let a friend from another layer invite you to their group. You will be transferred to this place and a new series of crowds will reappear. It’s a good way to make sure that some players aren’t in the camp of a certain crowd, and that it gives you some chances for a specific series of NPCs.