Blind Mary will possess your Minis to fight against you! Alright adventurers! Swarm her! She'll never see it coming!
Hold onto Squad Unbound Minis like Skeletons, Skeleton Party, or Whelp Eggs to waste the possession mechanic of the boss and save your push. Keep in mind that Whelplings will get possessed, but not the eggs - so place them at the boss!
For every PvE mission, there is a campaign version and a Heroic version. When you first begin the game, you can only participate in campaign missions. Upon collecting 50 sigils, you will then unlock Heroic missions.
Campaign missions will grant rewards after the first successful clear with ANY family. Heroic missions must be completed with EACH of the 5 different families in order to receive the mission rewards.