Trapped in the Nether starts the player in the nether with no way to get to the Overworld. Explore harsh lava biomes where death is almost certain to lush grassy areas where the trees grow.

Curse Mods:

StatusEffectHUD (by bspkrs)
ChickenChunks (by chicken_bones)
BiblioCraft: BiblioWoods Biomes O'Plenty Edition (by JDSinclair)
ExtraTiC (by JeanGlassmaker)
Carpenter's Blocks (by Syntaxial)
ExtraCells2 (by DrummerMC)
Chisel (by tterrag1098)
BiblioCraft (by JDSinclair)
CodeChickenCore (by chicken_bones)
Iron Chests (by progwml6)
EnderCore (by tterrag1098)
Ender Storage (by chicken_bones)
Ender IO (by CrazyPants_MC)
FastLeafDecay (by Olafskii)
FastCraft (by Player)
ComputerCraft (by dantwohundred)
Gany's Nether (by ganymedes01)
Minefactory Reloaded (by skyboy026)
Big Reactors (by ErogenousBeef)
Mantle (by mDiyo)
Lava Monsters (by docrobb)
Hardcore Wither (by thor12022)
Extra Utilities (by RWTema)
LootBags (by Malorolam)
Equivalent Exchange 3 (by Pahimar)
BdLib (by bdew)
Better Foliage (by octarine_noise)
BetterFps (by Guichaguri)
CoFH Core (by TeamCoFH)
AE2 Stuff (by bdew)
Applied Energistics 2 (by AlgorithmX2)
BiblioCraft: BiblioWoods Natura Edition (by JDSinclair)
JourneyMap (by techbrew)
Biomes O' Plenty (by Glitchfiend)
Blood Magic (by WayofTime)
Waila (by ProfMobius)
TiC Tooltips (by squeek502)
Perfect Spawn (by lumien231)
OpenEye (by OpenMods)
Natura (by mDiyo)
Redstone Arsenal (by TeamCoFH)
StartingInventory (by bspkrs)
SimpleLabels (by insaneau)
Tinkers' Mechworks (by mDiyo)
Waila Harvestability (by squeek502)
WAILA Plugins (by tterrag1098)
OreDictionaryConverter (by EXTER7)
NEI Integration (by tonius111)
NetherOres (by skyboy026)
Storage Drawers (by jaquadro)
Thermal Foundation (by TeamCoFH)
NEI Addons (by bdew)
Pam's HarvestCraft (by MatrexsVigil)
Netherless (by hilburn)
OpenModsLib (by OpenMods)
Soul Shards: The Old Ways (by SgtPunishment)
ArmorStatusHUD (by bspkrs)
Storage Drawers: Natura Pack (by jaquadro)
Utility Mobs (by docrobb)
Tinkers Construct (by mDiyo)
NEIlootbags (by Gigabit1011)
Thermal Dynamics (by TeamCoFH)
NotEnoughItems (by chicken_bones)
Storage Drawers: Biomes O' Plenty Pack (by jaquadro)
OpenBlocks (by OpenMods)
Thermal Expansion (by TeamCoFH)
Pam's Harvest the Nether (by MatrexsVigil)

Non-Curse Mods

Primitive Mobs (by Daveyx0)