A Middle-aged Sorcerer's Leisurely Dungeon Conquest - I Got the Strongest Skill by Using a Skill Orb, so I Think I'll Live as I Please~ is a Manga/Manhwa/Manhua in (English/Raw) language, ACTION series, english chapters have been translated and you can read them here. You are reading chapters on ManhwaZ fastest updating comic site. The Summary is
Haruhiko Ito, a company employee, is fed up with his busy work life and decides to quit and become a "seeker" who makes a living by exploring dungeons. In the beginning, he uses several skill orbs to acquire special abilities, but he keeps getting nothing. The last orb was also a failure... but what he got was the most powerful skill, "sorcery," which allows him to acquire a huge amount of magical knowledge! An ex-employee seeker becomes a savior with the strongest skill! The first volume of the long-awaited comic book adaptation of the adventure fantasy that ranked No.1 in "Syosetsu" genre rankings for daily, weekly, and monthly!