Totem Mod
China based "The Septenary Gods" or TSG for short, are a team of excellent mod developers. They have made an app called ModManager where you can install their mods through a click of the button. You can download the mod manager here, or from Orange Hat Tech (he posts all kinds of mods there and guides for modifying game files for new features etc.) You can also add Totem Mod manually with the TotemMod file below.
The Totem Mod package features a massive and beautiful new map called "Archipelago", with teleporting stones, wendigos and all kinds of trouble. It supports up to a mind numbing 11 players! The mod also features 4 new characters, 4 new spells and some exciting crafting recipes you won't find in vanilla DH.
Disclaimer:
TotemMod gets updated from time to time and you will have to update your files with it, so go to Orange Hat Tech or come back here if you're outdated and it's causing the game to crash all of a sudden. The Overlay is also a little behind the Totem Mod updates, so as of now, if using the Overlay to create servers, you and every group member must avoid using the newest female witch-character (will give black screen for that player), also the recipe for Molotov cocktails will not work. Use the Chinese server bot by Moeyy if you want all bells and whistles, just be aware you can´t adjust any parameters with that bot, like number of thralls, days etc. Only which mods you want to use.