The Mad Wizard of the Apocalypse

Dr Elias Vale spent forty-one years proving magic didn't exist. Then the sky split open—and every failed ritual began to work. At fifty-eight, Elias is wealthy, infamous, and considered either a visionary or a dangerous lunatic. His global occult archive, AI assistant Myrddin, private estate and network of amateur researchers were built for an impossible discovery. When alien structures descend and a new magical field floods Earth, he is the only person who has already performed eighteen thousand experiments on its rules. Governments want control. Followers call him the First Magus. Off-world powers are forbidden from intervening openly, but they can bargain, threaten and pay to keep humanity ignorant. Elias is offered wealth and safety if he buries his research. He publishes it instead. As cities fall and rival groups weaponise incomplete spells, Elias turns his estate into an institute, builds open-source wizardry and races to understand a power nobody was meant to share. He isn't a hero, doesn't want a team, and has no intention of letting aliens, governments or cults decide who gets magic. A science-driven apocalypse progression fantasy featuring experimental magic, AI-assisted research, first contact, institutional power struggles and an obsessive older protagonist who waited his entire life for the end of the world. — Description from novelcodex.org