A side story light novel series titled Senmetsu Madō no Saikyō Kenja: Musai no Kenja, Madō wo Kiwame Saikyō e Itaru (殲滅魔導の最強賢者 無才の賢者、魔導を極め最強へ至る, "The Strongest Sage of Annihilation Magic: The Unskilled Sage, Mastering Magic and Becoming the Strongest") has been published by SB Creative since September 2020 under their GA Bunko imprint with two volumes as of December 2020.

Lamenting the fact that his crest was considered ill-suited for combat and only useful for magic augmentation, an incredibly skilled sage decided to reincarnate thousands of years in the future.

Reborn as Mathias Hildesheimr, a six-year-old boy and the third son of a duke's family, he attains the crest of close combat he always desired.

However, the former sage uncovers signs of dark forces working in the shadows, and with humanity weaker than ever, it is up to Mathias to thwart their evil plans.

Shinkoshoto began serializing the series on the user-generated novel publishing website Shōsetsuka ni Narō in December 2016.

[87][5] In December 2021, it was announced that a mobile game based on the series, titled Shikkaku Mon no Saikyō Kenja: The Ultimate Reincarnation, will be released on iOS and Android in 2022.

[92] The following volume earned a B−, with Rebecca Silverman praising the improvements made to the story and pacing, as well as the consistently good art, while criticizing it for still feeling a bit generic, one character getting less development, and some odd translation decisions.