Aiming for a bit of realism here. Not as complicated as Terrfirmacraft, but difficult.
Hunger is an issue.
The ores ARE there, they come in veins.
Air quality is a factor (you can suffocate underground if you aren't careful)
You can over-heat/freeze to death.
You can become dehydrated.
MODS: (check updates, as I add mods they will be there)
bspkrsCORE & Armorstatus
animalsPlus
AppleCore
BetterFoliage
CodeChickenCore
CustomOreGen
denseores
EnderIO
EnviroMine
Ex-Nihilo
FullThrottleAlchimest
HungerOverhaul
Inventory
Tweaks
Jabba
JourneyMap
Mantle
NEI
Open
Blocks
Pam's Harvest
Ragdoll
Corpses
Tinkers' Construct
WAILA
WAWLA
WR-CBE
Hunger is an issue.
The ores ARE there, they come in veins.
Air quality is a factor (you can suffocate underground if you aren't careful)
You can over-heat/freeze to death.
You can become dehydrated.
MODS: (check updates, as I add mods they will be there)
bspkrsCORE & Armorstatus
animalsPlus
AppleCore
BetterFoliage
CodeChickenCore
CustomOreGen
denseores
EnderIO
EnviroMine
Ex-Nihilo
FullThrottleAlchimest
HungerOverhaul
Inventory
Tweaks
Jabba
JourneyMap
Mantle
NEI
Open
Blocks
Pam's Harvest
Ragdoll
Corpses
Tinkers' Construct
WAILA
WAWLA
WR-CBE