Helene is the glorious leader of all the other angel knights. She has held a grudge against the Master Alchemist after he denied her request to teach her alchemy because of her narcissistic attitude. She now plans to show him she has a perfectly fine attitude by crushing his forces without mercy. She already hears the victory trumpets and praise in her head.
Each mastery level adds another card to the cardpool for defeating Helene. Each of the bronze, silver, and gold mastery levels unlocks a new card, while it takes all three diamond and onyx levels to unlock a single card.