this is now closed some moderator please delete
Multiplayer? That’s not planned for a long time, And it would be pointless for the devs to just stop doing everything to implement multiplayer to a unfinished single player. You can’t make Multiplayer a mod, You can make mods for Multiplayer. A huge part of the community is excited for Multiplayer (my self included) But we all have to be patient, Plus Single player is pretty fun at the moment, It will happen when single player is feature complete I believe 
What @Stoneheartfan said, and by making it sound like a command, not a lot of people will help you. Maybe make your title a bit less commanding next time and think about the future and the pressent of the game when asking stuff like this.
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What would happen if someone created a multiplayer mod:
"Finished my multiplayer mod! AMAZING!“
next day
"Stonehearth Team: We’ve implemented multiplayer”
This is kinda true. The game in general doesn’t have too much to even do for multiplayer yet. Plus from the looks, the game will have all of it’s “core” features down by December. After that we can probably expect the stuff like game master and multiplayer and stuff.