SpaceRice's Pack

Features

This pack relies heavily on customized recipes to progress. 

It features numerous tech mods, ranging from Immersive Engineering to Mekanism.

It also features a couple of relatively balanced magic mods thrown in, such as Thaumcraft or Botania.

Along with the popular core mods, this pack includes a number of lesser-known 1.12 mods such as Aetherworks, Embers, Armorer's Construct, and Mystcraft. 

The main attraction of this pack is the difficulty of the mobs you'll face, along with the hundreds of structures and biomes to explore.

It is recommended to play on either Biomes of Plenty Generation or Quark's Realistic Terrain.

Extra Installation

It is also highly recommended that you install Optifine, along with PixelReality Luminance and Unity. 

If you're having lag problems while playing, try to pregenerate your worlds with /pregen

Dedicate at least 6gb of Ram, preferably 7gb to this pack. 

TLDR

If you enjoy a large variety of mods with a good amount of custom recipes, then this is the pack for you. Note that regular support may not be provided, as this is a private pack for a couple of friends.