The Spirit Mage Expelled from the Hero's Party: An "Unfavored" Class that Awakened to the Strongest Tier, Conquering the Five Great Dungeons with True Companions

"Endless Wings" - an elite party conquering dungeons at the world's forefront. Among them is Lars, a spirit mage who supports his allies by commanding invisible spirits. But when party leader Kristoff accuses him of being dead weight (since no one else can see his spirits), Lars gets expelled. At his lowest point, he meets the Spirit King in a dream, who warns him of the Demon Lord's impending resurrection after 1000 years of slumber.