The ultimate in-depth realism progression expert pack.
Underdog is the first Minecraft modpack that makes the game realistic in every possible way, from scratch.
It is the true RLCraft, TerraFirmaCraft with a good world generation for 1.12.2 and SevTech without magic all in one.
The description is work-in-progress, be patient.
The best place to set up a server to play the Underdog modpack is at: https://bisecthosting.com/underdog