Elves Era: My Elf Is the Best!

This is the era of powerful trainers! This is the era of great elves! There are many kinds of elves in this world. What changes will a person from another world bring to this world after traveling through it? He has a golden finger, starts with his favorite snow elf, and has the support of his parents. What era is this? This is my time! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.