Returner Created the First Mecha System

Jaxon battled the world's last and strongest dragon but couldn't save the world. Unexpectedly sent back ten years into the past, decades earlier than expected, he attempted to prevent the dragons’ return. Using his newfound ability, he created a massive humanoid weapon he could control remotely called Mecha. Determined to save the world, he sought to defeat these enormous monsters with his Mecha. —- A/N: A story about a returner creating mechas to fight off dragons and other monsters. An adventure in a world where artifacts, gadgets, magic, and mechanics intertwine.