“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.
Magical attributes play a big role 
in how a magic battle can play out.
.تلعب الطبائع السحرية دورًا مهمًّا في سير المعارك السحرية
Bei Kämpfen mit Magie spielte
die Typeneffektivität eine enorme Rolle.
La compatibilidad de tipos
es vital en los combates mágicos.
La compatibilidad de tipos es vital
en los combates mágicos.
Les attributs magiques influencent
grandement l’issue d’un combat.
Gli elementi magici sono un fattore importante 
nello svolgimento di uno scontro fra maghi.
Atributos mágicos são decisivos no
decorrer de uma batalha mágica.
В магическом сражении
большую роль играют элементы.