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:

Black Cat Familiar
2 Epic Potions of Speed
2 Epic Potions of Giant's Strength
2 Epic Potions of Clairvoyance