Karlee isn’t one of the best characters in Back 4 Blood, but she still has some killer abilities that deserve a spot in your team. Most notably, Karlee can sense nearby hazards and Special Ridden, so you won’t be surprised when a Tallboy smashes around the corner. She also gets an extra quick inventory slot (used for defibrillators and stun guns) and increases the team’s use speed by 50%.

This guide will show you how to make the best Karlee build in Back 4 Blood, so you can stop staring at cards and start using them. Of course, you’ll need to unlock all the cleaners in Back 4 Blood before you can play as Karlee (beat first 4 levels of Act 1).