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FLUOOOSH!
A Blazing Wall emerged in a split of a second, which I reinforced by fusing it with multiple Blazing Walls at the same time, I conjured the usually Tier 2 Spell over fifty times in just a few seconds, Mana flowing through my body almost endlessly!
BOOOM! BOOOM! BOOOM! BOOOM! BOOOM! BOOOM!
The Water Projectiles were as powerful as Tier 4: Rank 10 Spells! It was almost Tier 5 in that sense. Aquarina could only protect us as much with her Water Control before the pressure and Mana spent overwhelmed her.
"Ge behind me!" I called everyone.
"S-Sylphy! Let me handle this! I can control water!" Aquarina said.
"No, you can't just waste all your Mana into this!" I told her.
"But hold on! Isn't Fire the weakest element against Water?!" Asked Zack. "Also you surely don't have endless Mana either!"
Check "The Protagnist's Sister Is Actually the Strongest"!