You can get enemy leaders to join your army and get access to all their special attacks while using them out in the battlefield. (gamerstemple.com)
You can adjust their battle role to prioritise a general role like Offense, Defence, and Support, or you can get way more granular and have the individuals focusing on using spells, guns, or even whether they target grunts or enemy leaders first. (blog.eu.playstation.com)
For 20 points and 50 points, you can send in an enforcer, a stronger unit with unique abilities that can either attack enemy leaders or buff your clan members. (playstationenthusiast.com)