The trick lies in the 
Soul Harvest Witch Power. Whenever you use a skill with a cooldown when there are monsters in range, you gain extra Main Stat. This is extremely powerful as Main Stat is basically your main DPS scaling, and in some builds like Earthquake Barbarian, you have double scaling thanks to aspects.
The Negative Snapshot
What most people do when they start a Pit run is they attack the very first mob with a cooldown spell which grants them very little Main Stat stacks and you end up with a negative snaphot. This is something you should absolutely avoid.
How to Maximize Your Main Stat Stacks?
What you want to do when you enter a Pit is to make sure your first cast to get the buff hits as many monsters as possible for maximum stacks from theSoul Harvest Witch Power.
Further attacks will refresh the duration of your buff, regardless of how many mobs you attack. If you attacked 23 monsters at the beginning with a cooldown skill, the positive snapshot will consist of 23 stacks of the buff and you can refresh it with just 1 monster.
It’s extremely important to attack as many mobs with a cooldown spell as possible when you enter a Pit.
For more details, check out Rob’s latest video on the topic.
