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The Giant Rat King held a mysterious purple colored crystal on its chest. It didn't imbue it with any sort of power, but it was indeed strange. However, Monica and her friends, although cautious, paid it no mind when they detected it didn't make it any stronger.
"GRYSHAAAH!"
The battle began right away, as the Rat King roared with fury, leaping into action. Its movements were fast and powerful, holding great strength and weight in every move it unleashed. Its big and spike-covered tail was a deadly weapon it used constantly, trying to sweep the girls off their footholds with it.
Its sharp fangs could tear through any shield or magic barrier, and the girls were constantly forced to escape and evade the Rat King's attacks. Monica unleashed all of her curses against the ferocious beast.
Check "The Protagnist's Sister Is Actually the Strongest"!