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The reason behind Kate's powerful mechanized dragon fists being so strong wasn't just because of her powers alone, as much like it happened with Benladra, Agni concentrated his powers and imbued them into Kate, boosting one of her Divine Abilities to its limits!
Ding!
[Through the powers of {Oracle of the Primordial God of Fire, Agni}, your [Divine Technomancy] Divine Ability has temporarily evolved into its strongest form [Divine Mechanical Creation (SSS)]!]
[Temporarily, you're capable of reinforcing the materials that make up your Mechanical Creations, enhancing their Durability, Power, Flying Speed, and Weight by +200%!]
Kate's entire draconic body exuded a powerful gray and blue-colored aura, as her Divine Ability evolved towards a completely new level, not only was she able to create new kinds of stronger metals, but even enhance her creations Stats by up to +200%!
"SHAAAAH!"
Check "The Protagnist's Sister Is Actually the Strongest"!