If you had a vital instrument what would it be and what would its powers be?

A vital instrument is a core power system in the manga Gachiakuta, referring to ordinary objects (like an umbrella, rings, or a charm) imbued with immense power by a user through intense care, love, and emotion. These objects transform into weapons or tools with unique abilities.    

mine might be hoodie that would generate lots of heat idk

white monster that teleports me to agartha

0818 monster that turns me into Allan

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welp this thread gonna die

a staff of homa permanently infused with pyro

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Snaol 🐌

buuuuuuump

There's manga about several op highschooler got transmigrated to another world, but I forgot what the name of this manga. The power that i want is from one of character in that manga, basically his power is able to know how much value of an object.