Alchemy
noun
Tempering gold is a technique so magical that we can consider it to be alchemy.
れんきんじゅつ
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
ある錬金術士が鉛を金に変えようとして失敗した日、外は雨がザザ降りでした。
The rain poured down outside on the day the alchemist utterly failed at transforming lead into gold.