This atmospheric mod will add to the game a new dimension of “Betweenlands” – a dark, mystical swamp, teeming with hostile creatures. The mod is still under development, so you may come across various errors.
The Betweenlands Mod for Minecraft 1.12.2
How to create a portal
In order to create a portal you need to get 4 pieces of the talisman, killing the dark druids. After this, putting the pieces on the altar of the dark druids you will get a staff, then find a large free space and plant a tree seedling, pick up the staff and right-click on the seedling.
Download Link: TheBetweenlands_1.12.2_3.5.5_universal