#1 - Nov. 21, 2014, 7:20 p.m.
Blizzard Post
There's been some confusion regarding the various items you can use that allow you to change a trait on one of your Garrisons followers, so we wanted to clarify how these items work.

If you use an item such as the Supreme Manual of Dance or the Hearthstone Strategy Guide, the targeted follower will gain the trait associated with the on-use item, and lose a random trait which cannot be selected or changed after the fact. Currently, the tooltips for these items are not specific enough about the randomness associated with their outcome, and we're working on getting them adjusted.

So if you're now missing a follower with a specific trait you want or need, remember that you can level your Inn or Tavern to tier 2 to gain access to an NPC who will hunt down new followers. When one becomes available, you can then limit your search based on the traits you desire.