Summoner Saga: The Legendary Spare Key

This is a Summoner novel that takes massive inspiration from the NASUVERSE FATE series, UnOrdinary, Solo-leveling, and basically every dungeon raiding and cultivation Manhwa ever. I was vastly inspired by one of the most popular novels on this site written by DD_TheDreamer. I have given various nods to their work, and have as such garnered their blessing to continue the birth of my own work. This verse will be one where those with prominent family ties rule most of everything. The strong rule with power, influence, wealth, manipulation, and many other things to keep the weak down as a blissfully unaware, meek, and eager populace. Survival of the fittest rules this world. The Main Character will start weak, basically a normal human kid, having unlocked his Summon spirit very early on as a mere toddler. This normally would have had him regarded as a prodigy, save for the fact that his Summon was utter trash. However, there lies a small discrepancy between his Spirit Realm and His dream realm. Plaguing his dreams, stands a giant mysterious, corroded, petrified stone gate. A Gate so large and immense that he can never even see the ends or top of it. But whenever he focuses, whenever he truly looks at it he gets the faintest glimpse of gold beneath all the corrosion. Yet when he's awake all he sees is the small and useless little rusted spare key.