절대영도

Requires owning Jingliu, then going to the Rating Pistol in Herta Space Station Storage Zone F1.

In physics, absolute zero refers to the lowest possible temperature where nothing could be colder and no heat energy remains in a substance. It is equivalent to 0 Kelvin, -273.15 Celsius, or -459.67 Fahrenheit. In Star Rail, we won't spoil for you the rating Jingliu gets with the Rating Pistol.