Suzuri no Tamashii

Suzuri no Tamashii (の魂 すずりのたましい Ink Stone Spirit) is a physical manifestation of Yin Release chakra that forms visually upon the hands or arms of specific Kirichigai Clan members. This disfigurement also causes the fingernails to darken to a blue and chronic hand pain when being utilized. The only current member of the Kirichigai Clan is Nazobi Kirichigai is the sole surviving user of this Kekkei Genkai.