Temperature Talisman and Cold Talisman
"What's the difference of these two talismans?" Arnold was now interested.
"Cold talisman can only reduce the temperature around you so that you can feel comfortable. The temperature regulator talisman could reduce or increase the temperature in accordance to what you want," Riya replied. "If you find it troublesome, you can also set it to directly increase or reduce the temperature until it reached the most appropriate temperature."
This talisman was very popular in that world.
It could be said that for many rune master and talisman master, the temperature regulator talisman was the first talisman they would learn after they mastered a few ordinary talisman. Because this talisman was used by many magicians and magic warriors.
That world has many extreme environment.
Some areas were extremely hot and some other areas were extremely cold.