The Blim Mod

This mod adds a new dimension called planet green. It can be accesed by collecting portal shards from portal vines, allowing you to craft a dimensional magnet from nine of them. Now you can fight portal pig. Once you beat him you can acces planet green by igniting a portal made out of GreenBits. These can be found commonly underground. Once you enter the portal you can find blimitite underground to make gear, containers, and more.

Besides blimitite, there is much to explore, including 5 new biomes. Some of them have bosses to fight, and some of them.. well, you never know..