Class change

Classes are changed without quests: Alt+B → Career → Professions.

When and how much

• 1st class — from level 20, free.
• 2nd class — from level 40, 300,000 adena.
• 3rd class — from level 76, 5,000,000 adena.

Skills

• Skill books: some are sold in Alt+B → Shop → General → Books, some by merchants in towns, the rest drop from monsters.
• Where a book drops — search the Drop Database.