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Silver was struck down in such a war on his home planet, but he didn't die. As the war ended, the enemy soldiers gathered survivors, he had barely survived, although his two legs were broken and his left arm was chopped off, he was dying out of bleeding but was rescued by his enemies.
And it wasn't for something good.
The enemy nation had been receiving the help of space pirates, and the strange technology the enemies used to defeat his nation's army were precisely given by them. And they collected the survivors for the sole purpose of experimenting on them… with technology.
Silver counted each day that passed since he was sent into that dungeon and experimented on. The men there used all sorts of weird gadgets into his wounded body, feeding him with cheap potions until he fully healed only to open up his body and insert all sorts of technology items, mixing them with his flesh and nerves, and fusing him with all of that technology.
Check "The Protagnist's Sister Is Actually the Strongest"!