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"{Eternal Tempest}!"
FLUOOOOOSH!
Brunhild summoned the power of the Wind and Lightning Element as the clear skies of the desert changed in mere seconds. She began pushing herself to her limits as she started to spend all her Mana reserves without stopping.
An enormous thunderstorm and windstorm emerged, which combination was named Tempest! And the Eternal Tempest Spell was one of the strongest Wind and Lightning Spells that Kireina taught to Brunhild!
FLUOOSH! CRAAASH!
Powerful slicing wind currents and deadly, destructive lightning strikes began raining over the Necrotic Death Lord, as the skeleton-faced bastard only laughed at Brunhild's struggles. Although the powerful magic was damaging his soul and body, she would need a hundred times that power to actually kill him.
Check "The Protagonist's Sister Is Actually the Strongest"!