Hero Subclasses are advanced specialization paths available to heroes in Remixed Dungeon. Each hero class can choose a subclass after defeating the second boss (Tengu).
The Tome can be found after defeating Tengu (the 2nd boss)
Each hero class has two subclass options to choose from
Special Cases: The Necromancer and Gnoll classes cannot normally use the Tome of Mastery. Instead, the Gnoll class can use a Tengu Liver (dropped by Tengu) to choose between Guardian or Witch Doctor subclasses.