| Fiendish Feat!|
Complete a 'Do 30 Damage as a Zombie Hero' quest.
For the most part, Heroes will only have 20 health in a battle, so this might take a couple of battles to do. Boss Battles where the opponent has more health are good ideas for doing this, and heroes that heal themselves also make it easier. Consider using tricks like Bungee Plumber, or Zombot's Wrath to make this easier.