I'm Not Human Anymore, but I'm Not Ready Yet

My name is Ariel Homit. Here among us, there are two types of genius. One can rub meteorites, and the other can cut mountains with one sword. And I am the third type - the son of a blacksmith, a magic insulator, and my swordsmanship is mediocre. My only ability is to "adapt". If you are burned by fire, you will gradually become less afraid of fire. Being frozen will gradually make you less afraid of the cold. Sounds invincible, right? I originally thought so too. Until I learned its cost. Every time I adapt, it consumes my own life. ——God, this golden finger was given to me on credit, right? ! I looked at the dark army of demons outside the Great Wall in the North, and then looked in the direction of the scorched wasteland. The fourth maze battle is about to begin. In this world where strong people are as numerous as dogs and demon kings roam everywhere, how am I supposed to survive as a "credit person"?