Familiars are NPCs that you can assign to certain tasks, such as leveling up Champions, clicking the monsters, or using ultimates. Depending on the assigned task, a Familiar will click a certain number of times per second/minute.
In this pack:

Iron Pup Familiar
8 Epic Potions of Speed
8 Epic Potions of Giant's Strength
8 Epic Potions of Clairvoyance
8 Epic Potions of Fire Breath
8 Large Blacksmithing Contracts
2 Potions of Polish