Harder Than Obsidian is an Exploration focusedFantasy style Modpack that is intended for Multiplayer but also works fine in Singleplayer

Some of the Features:
InGame VoiceChat
Dragons:
ProjectE
Vampire

Werewolfs

New Biomes

Temperature & Thirst System

Spartan Weaponry

Discord for Official SMP: https://discord.gg/Y7ce6YmYNJ

Includes following mod:

Time Control (by Unixkitty)
Just Enough Resources (JER) (by way2muchnoise)
Serene Seasons (by TheAdubbz)
Better Builder's Wands (by Portablejim)
First Aid (by ichttt)
Expanded Equivalence (by Zeitheron)
Hwyla (by TehNut)
ProjectEX (by LatvianModder)
Potion Core (by Tmtravlr)
Improvable Skills 3 (by Zeitheron)
Collective (Forge) (by Serilum)
Open Glider (by gr8pefish)
Vampirism Integrations (by maxanier)
Morpheus (by Quetzi)
IvToolkit (by Ivorforce)
GameIdiot's Craftable Wizardry Items (by GameIdiot153)
Redstone Flux (by TeamCoFH)
Hammer Lib (by Zeitheron)
Villager's Valley Custom Terrain Survival Map (by Luki_exe)
Waystones (by BlayTheNinth)
Wizardry - Fates (by windanesz)
Placebo (by Shadows_of_Fire)
Disenchanter (The Disenchanter Mod) (by impelon)
FTB Ultimine (Forge) (by FTB)
Armor Underwear Mod [FORGE] (by The_Wabbit0101)
ItemPhysic Full (by CreativeMD)
GraveStone Mod (by henkelmax)
Wizardry Golems (by windanesz)
Better Ping Display (by Quintinity)
Bloodmoon (by Lumien231)
Quality Tools (by Tmtravlr)
Structurize (by H3lay)
Mo' Bends (by IVESIRIS)
Tough As Nails (by TheAdubbz)
Spartan Weaponry (by ObliviousSpartan)
FTB Backups (Forge) (by FTB)
Vampirism - Become a vampire! (by maxanier)
Ice and Fire: Dragons (by alex_khaan)
Davincis Vessels (by darkevilmac)
Bed Wars (by NathanBunTV)
Atlas Extras (by Rikshy)
Wawla - What Are We Looking At (by DarkhaxDev)
EMC Builders Wand (by FusionLord)
Oh The Biomes You'll Go (by AOCAWOL)
U Team Core (by HyCraftHD)
Mike's Mods Library (by pkmnfrk)
Custom Main Menu (by Lumien231)
Construct's Armory (by TheIllusiveC4)
No Recipe Book (by Seneschal_Luwin)
Gliby's Voice Chat Reloaded (by Ivasik78)
Mantle (by mDiyo)
Inventory Tweaks [1.12 only] (by JimeoWan)
Useful Backpacks (by HyCraftHD)
Controlling (by Jaredlll08)
Resource Loader (by Lumien231)
Eye of Dragons (by mkaaay2910)
Corpse Complex (by TheIllusiveC4)
Recurrent Complex (by Ivorforce)
View EMC (by Silly511)
VanillaFix (by Runemoro)
AppleSkin (by squeek502)
Craftable Horse Armour & Saddle [CHA&S] (by EwyBoy)
AlcatrazCore (by AlcatrazEscapee)
FTB Utilities (Forge) (by FTB)
Fast Leaf Decay (by olafskiii)
Speedy Hoppers (by al132)
Iron Furnaces [FORGE] (by XenoMustache)
Just Enough Items (JEI) (by mezz)
Baubles (by Azanor13)
Iron Chests (by ProgWML6)
TexFix (by Speiger)
Mowzie's Mobs (by bobmowzie)
Spartan and Fire (by cbkovak)
MineColonies (by H3lay)
Balanced Project E (by SoapyDo) - Link to the Original ProjectE: https://www.curseforge.com/minecraft/mc-mods/projecte
Better Combat Rebirth (by SanAndreasP)
FTB Library (Forge) (Legacy) (by FTB)
LLibrary (by _ForgeUser11902522)
Inventory Pets (by Purplicious_Cow_)
MovingWorld (by darkevilmac)
Roguelike Dungeons (by Greymerk)
Extra Golems (by skyjay1)
Spartan Shields (by ObliviousSpartan)
Tinker's JEI (by possible_triangle)
CreativeCore (by CreativeMD)
Toast Control (by Shadows_of_Fire)
Mouse Tweaks (by YaLTeR)
Extra Spells (Electroblob's Wizardry) (by meldexun)
Clumps (by Jaredlll08)
Always a Wither Skull (Forge) (by Serilum)
Inventory HUD+ (by dmitrylovin)
Electroblob's Wizardry (by Electroblob)
Villager Names (Forge) (by Serilum)
No Tree Punching (by AlcatrazEscapee)
Carrots Library [FORGE] (by The_Wabbit0101)
Nature's Compass (by Chaosyr)
Neat (by Vazkii)
Howling Moon (by razmenwolf)
Antique Atlas (by Hunternif)
Player Trade - Secure Trading Between Players (by Zetal)
Tinkers Construct (by mDiyo)
FoamFix (by asiekierka)

Harder Than Obsidian

AlcatrazCore

Always a Wither Skull

Ancient Warfare 2

Antique Atlas

AppleSkin

Applied Energistics 2

Armor Underwear Mod [FORGE]

Atlas Extras

Balanced Project E

Baubles

Better Builder's Wands

Better Combat Rebirth

Better Ping Display

Bloodmoon

Carrots Library [FORGE]

Clumps

CodeChicken Lib 1.8.+

Collective

Construct's Armory

Controlling