The Final Battle Was Actually Shirou Emiya?!

Mirror Counter!

It was only when Great Sage threw out that shield that Rimuru suddenly remembered this piece of equipment... or rather, treasure, that he had long forgotten.

This dainty women's counter shield lived up to its name. Other than increasing its own durability, it had only one simple effect: reflecting attacks. Its attributes were quite ordinary, yet its rank was absurdly high, nearly on par with Avalon.

That was precisely why Rimuru had forgotten about it. Its attributes were unimpressive, and it had no reputation to speak of.

Rimuru could reflect most attacks with his own power anyway, so he had never needed it. But now... he understood.

What did it mean when an extremely high-ranked piece of equipment had only one effect or attribute?

It meant that its single effect was powerful to the extreme!!

Remember to thank Miss Kitagawa after we return. As Great Sage's lazy voice fell, the shield abruptly transformed into a magnificent mirror rippling with light, directly blocking the vortex overflowing with destructive energy.

Crack— The instant they made contact, fissures began spreading across those ripples, making Rimuru's palms sweat.

But in the end—

"How... is that possible?!" Gilgamesh's pupils contracted in shock. He watched helplessly as the enormous phantom mirror and the shield behind it shattered apart, only for his attack to... whoosh back along its original path toward him!

What... what Noble Phantasm was that?! The King of Heroes instinctively wanted to retreat, but his body froze. He suddenly realized that there was nowhere left for him to go... Having unleashed all his power, his spiritual foundation was collapsing. His fate was complete annihilation.

Boom! The colossal vortex pulverized the surrounding world, and his body began to shatter along with it.

Yet he continued staring fixedly at the shield as it broke