Every adventurer needs a companion to join him on the journey to vanquish all demons from the realm of men. In Diablo 3 you rarely find yourself playing alone. You can get friends to join you or hire Followers to serve as a combat assistant.
The General Mechanics Of Followers
There are 3 types of Followers to choose from and all of them are available ONLY when playing in single player. They come with various abilities and have a Follower specific item that can be equipped to boost their stats. They all have 8 skills each to choose from. However, only 4 can be used at a time but the player can change them at any given time. They are not available from the start. The first 2 skills become available at level 5. The player will chose only 1 of the 2. The next one is unlocked at 10, third at 15 and fourth pair at level 20.