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Silver was decided to take care of the walls, he wanted to quickly give back the protection of his city to his master Valen. After he killed whoever was taking over it, he would be able to take control of the walls and manipulate them to close once more, making it so the enemies are trapped inside, ready to be easily picked up if any of them is still alive after he was done.
"And after that, I'll be rewarded by my lord, how convenient!" He laughed to himself. As he waved his hand and several gray-colored magic circles appeared, in fact, they were over 30 of them!
FLASH! FLASH! FLASH!
From within them, nanobots gathered and materialized into flying mechs the size of three meters each one, carrying large laser guns and being fueled by powerful magic cores infused with divine power. This was one of Silver's new abilities, the power to summon troops to battle!
Check "The Protagnist's Sister Is Actually the Strongest"!