What is kurapikas eyes?

Kurapika's eyes are a defining feature of his appearance and his character. They are a bright, piercing red color and are sensitive to sunlight and other bright light sources. Kurapika's eyes also hold a unique ability called the "Scarlet Eyes," which allows him to use powerful Nen abilities that are specifically designed for hunting and killing members of the Phantom Troupe, a group of thieves who killed Kurapika's clan. The Scarlet Eyes are highly sought after by other Nen users, as they are believed to hold tremendous power. Despite their strength, Kurapika tries to keep his eyes hidden from others in order to protect himself and his allies.