“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.
The devil turned the 
haggard Patry into a dark elf
،تمكّن الشيطان من تحويل باتري المنهك إلى إلف أسود
Der Teufel verwandelte
den in tiefe Trauer verfallenen Patri
El diablo transformó a Patry
en elfo oscuro
El diablo transforma a Patry
en elfo oscuro
Le Malin change en elfe noir Patry
qui est rongé par ses tourments
Il demone trasforma Patry in un elfo oscuro,
giunto ormai al colmo della disperazione,
O demônio conseguiu transformar
Patry em um elfo negro
Дьявол превратил измученного Патри
в тёмного эльфа,