Features

The main feature of this pack at start was extra dimensions, however I started adding more mods as the pack carried on.
As such, the Aether (opposite of nether), Atum (desert dimension), Twilight Forest (extra bosses, as the original game only has 2, maybe 3 depending on how you look at it) and more dimensions have been added to add more content to the base game.
The 3 base dimensions in the game have also received updates, such as an updated nether, an updated end and several noteworthy changes to the overworld, such as extra biomes and more creatures, such as a Grue.
There have also been additions to the main game as well, such as grappling hooks, magic, and many many more items, such as obsidian tools.
Base mobs have received buffs.

Running the Mod

Simple, download the Twitch Client and search for CrashCraft on it

However, you should increase your RAM allocated to Minecraft.

To do this:

Click on the installations tab

Go to the install titled CrashCraft

Click the three dots

Click on edit

Expand options by clicking on more options

Go to the JVM Arguments section, and increase the values for -Xmx and -Xms

"m" here means megabytes, 4GB is 4096 MB

Make sure the value for -Xms is not larger than the one for -Xmx

Make sure the value for -Xmx is not smaller than the one for -Xms

However, they can both be the same value

The values I personally have set are -Xmx4098m -Xms4072m

You should not allocate half of your total RAM to Minecraft

For example: If you have 16GB, do not allocate 8GB, allocate less.

If you do not know how much RAM you have, it's found in About your PC in Windows Settings.

When done, click Save, and launch the game.

Mods

Mods list here

My Twitter

My Twitch

CrashCraft

[ANGRY PIXEL] The Betweenlands

AbyssalCraft

AbyssalCraft Integration

Albedo

Albedo Torches

Animania Base

Anvil Patch - lawful

Apotheosis

Atum 2: Return to the Sands

Better Placement

Better Survival mod

BetterFps

Biomes O' Plenty

Biomes o' Plenty Tools

Bloodmoon

Blur

Butterflys

Carry On

Chest Cow

Chisel