I Got A Cheat Skill In Another World And Became Unrivaled In The Real World, Too (Manga) Vol 04

While exploring the Weald, Yuuya Tenjou happens upon a mysterious cave. Inside, he finds a document penned by a legendary sage that he uses to inherit their mana pathways, gaining exceptional skills and all-powerful magic. Now there's nothing that can stop Yuuya-not even the laws of nature! Yen Press
(W) Miku (A) Kazoumi Minatogawa, Rein Kuwashima