Mod: Twilight Forest
Link: http://www.minecraftforum.net/…est-v2-3-5-wrecking-block
Note: still in 1.7.10, last updated 16/5/2015, exist alongside a modpack that was accepted
This mod adds a new dimension to minecraft called the Twilight Forest. It is centered around exploration with an RPG-based progression system. How the progression works is certain objectives, usually in a form of a boss mob, must be defeated in order for the player to advance to different areas of the dimension. Majority of the content will be in the Twilight Forest, which means that the overworld may be neglected entirely once the portal to it has been made.
I personally don't know how this forum defines a popular mod, as the pinned thread states, but statistic show there are at least 4,130,454 downloads overall. I also don't know if the expectation for a mod request is redundant if it already exists alongside in a modpack, which I personally don't have any interest to.
