I Can Only Cast Fireball?!

Einer has always aspired to unlock the game-like system that has governed his world since the beginning of time. The [Monoliths] that hold the prospect of power, riches, and great adventure could only be accessed by those who had received an instance of the system. When Einer turns 17 and unlocks the system through a skill book, he has the fortune of holding a unique ability, the bar that holds the common adventure apart from the top rankers. However, this unique ability ruins all of his great plans for adventuring as a valiant Armor Knight. - [Stone Skill Book: Fireball] [Learn: Y/N] "yes!" [You Learned a Skill Book and Unlocked the System] [Welcome User: Einer] - Cover art was shamelessly stolen from https://www.deviantart.com/ishutani okay there might have been a little shame involved.