“When the owner of the four-leaf grimoire is filled with despair, the five-leaf clover grimoire will be born.” Patry is filled with despair after learning he had been manipulated by the devil all this time and turns into a dark elf. He then starts attacking Yuno and Asta, fueled by nothing but hatred and malice. Somehow, becoming a dark elf had made Patry even stronger, which gives Yuno and Asta an even harder time fighting him. Then Captain Nozel appears before them. Nozel happens to have the best magical attribute to fight against light magic, mercury magic.
but that was all part of this 
devil's 500-year-old plan.
وكل ذلك كان جزءًا من خطة 
.الشيطان التي عمرها 500 سنة
Pero resultó ser una manipulación
del diablo de 500 años.
Pero al final resulta que es
una manipulación del diablo de 500 años.
et leur résurrection,
unique ambition de l’Œil maléfique.
e era tudo parte do plano
de 500 anos do demônio.
оказалось спланировано
пятьсот лет назад Дьяволом!