The pack of nightmares

The pack is made with the idea of discrediting the snowball effect. This means that the pack will become easier as you move on in it but won't become out of control. As for features:

Multiple sources of automation

Many news mobs (abyssal craft mainly)

new dimensions (abyssal craft mainly)

A challenge of new stats. (Thirst, Heat,Re-worked health etc... Good example Tough As Nails)

Advanced mobs such as climbing zombies and creapers busting down walls.

Magic (Botania etc...)

And a looming sense of dread.

If you are going to make changes to the pack you should follow a few steps to assure the lag is minimized.

if a mod you included adds Mobs use the /tellme command to gather a list of mobs in the game.

Then delete every id except for the mobs that are added by the mod.

then open the epicseigemod config and add those mob ids to the blacklist.

This will prevent that mod from trying to re-work the Ai's it is not meant to and causes less error and lag issues in the process.