Lynn's gaze swept over the ten first-ring spells. After hesitating for a long while, he chose Touch of Frost as the subject of his improvement.
The principle behind this spell was quite simple: it manipulated the elements in the air, lowering their temperature and condensing them to interfere with enemies. Its usefulness in battle was rather limited. If it did not have an advanced spell, [Ice Domain], few people would likely be willing to learn it.
Naturally, Lynn had no intention of learning it. Instead, he planned to modify it based on its principles—for example, by using a different element to cast the spell!
And the element he had chosen was... nitrogen!
This element was known in the Land of Wizards as [Seru]. In Coru's manuscript, it had even been classified as a useless element...
Considering that nitrogen generally did not react with other substances, it was only normal for some wizards to dismiss it outright.
However, Lynn knew that nitrogen was far from as useless as Coru claimed. Not only could it be used to make fertilizer and serve as a protective gas, but it could also combine with hydrogen to form another toxic gas: ammonia...
Most importantly, nitrogen had a boiling point of minus 196°C. Such terrifyingly low temperatures were enough to freeze the vast majority of things in an extremely short time!
Of course, due to the Leidenfrost effect, the human body could briefly withstand extreme temperatures. But the protection formed by the vapor layer was exceedingly fragile and would collapse in just two seconds.
After that, fragile skin would be exposed directly to the bone-piercing ultra-low temperature. The cells in the epidermis would rapidly die and peel away, followed by all the fat, muscle, and blood freezing solid in an instant!
The second reason Lynn had