The New Punishers
The idea of teaching everyone the shadow ability had popped into Quinn's head more than once, but it all started when Sam first asked if he could learn the shadow ability. It was a strong defensive ability that could be utilised in many different ways. Due to vampires and subclasses being strong and having their own set of skills. The two things worked well together.
In the past, those with the shadow ability were known as the Punishers, and they were so strong that they were feared by other vampires. It was clear it was a good ability and worth teaching others. They had all seen how Quinn was able to use it in battle and didn't question whether the ability was good or not.
As time went on, Quinn found more reasons for the others to learn how to use the shadow ability, such as Linda with her transformations. The shadow equip, and dimensional space would have been perfect for her.