this is a zombie modpack, its kinda bad but it should be fine to play and it will get better
you start in a bunker in the middle of an apocalypse, your supplies have run short and the world is at an end. but not for you. exit the bunker and scavenge for loot in massive city constructs from the lost citys mod, fully customizable from the world generation menu, this combined with the ever looming threat of the zombie invasion make this one extremely difficult. tough as nails makes this even more difficult with the environment playing a huge factor.
there are other mods like shaders, rubidium and create that enable you to rebuild your society and take back the wastes