“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.
I couldn't use it in the last battle 
because my magic was being disturbed.
لم أتمكّن من استعمالها في 
.المعركة السابقة لأنّ سحري كان مشوّشًا
konnte ich sie in dem Kampf vorhin nicht verwenden,
in dem die Kontrolle geschwächt wurde.
Por eso no pude usarlo
en la anterior batalla.
Por eso no pude usarlo
en la anterior batalla.
je n’ai donc pu lancer ce sort
à la fois subtil et colossal.
per questo non l'ho potuto usare nell'ultimo scontro,
con quell'incantesimo che interferiva con il mio mana.
eu não usei na última batalha,
pois estava sob interferência.
В прошлом сражении, где чары были нарушены,
я не смог им воспользоваться…