Pixel's Eternal Winter
A modpack compiled by PixelTK.

White, cold ice falls from the sky, never-ending, with the only way to escape it to be leaving this world. The trees, foilage and plants live on, and so do the creatures that inhabit it, but some adapted in horrific ways. At least for people like you, the world is still inhabitable if you're willing to fight through. It's not as if the other worlds will give you anything better, and arguably? The caves are the worst place to stay.

A 150+ mods list with minor configuration, a little element of horror sprinkled in, some magic, tech and a sprinkle of exploration.
Tested with 6 GB of ram allocated. Plays fine on singleplayer, but I'd recommend offloading some stuff to a server if possible.