Lanster transmigrates to another world and obtains a System that lets him improve his magic skills by burning through his lifespan.
Burning lifespan, you have grasped the Law of Annihilation through practicing [Fireball].
You have grasped the Law of Tribulation Lightning through practicing [Lightning Bolt].
Even Lanster's constitution can be improved by burning lifespan.
“Is that guy really a mage? My blade's gone dull from hitting him!”
Many years later, a bard with a lute slung over his shoulder sits beneath the city walls of the Lotharion Continent, telling people the story of Lanster, the God of Magic. His tales always draw countless listeners.
If I hadn't just checked on you when I was fine, otherwise I wouldn't have known you were alive.
He is an old author. Although the subject matter has changed, he will continue to write step by step and the quality is still guaranteed.