Short answers, pulled from the story.
Meguru Seto uploaded the first chapter of The Hidden Dungeon Only I Can Enter in January 2017. Kodansha acquired the rights to the story in August 2017 and began printing physical volumes on the 1st of August 2017.
Noir Stardia uses the Great Sage skill which grants him unlimited knowledge but causes terrible headaches after each use. This ability allows him to Create, Bestow, or Edit abilities by spending accumulated Life Points while trapped within a hidden dungeon.
Tomoyuki Hino began drawing the manga adaptation of The Hidden Dungeon Only I Can Enter on the 2nd of May 2018 through Kodansha's Suiyōbi no Sirius service. The series concluded its run on the 20th of June 2023 after five years of serialization.
The anime television series adaptation of The Hidden Dungeon Only I Can Enter aired from January 9 to the 27th of March 2021. Viewers watched the show on the Animeism programming block across MBS, TBS, BS-TBS, and AT-X channels.
Seven Seas Entertainment secured rights to publish both the light novels and manga of The Hidden Dungeon Only I Can Enter in North America. They released the first volume of the English version on the 17th of November 2020.