Yerin's Blood Shadow

Yerin's Blood Shadow begins as a parasitic crimson duplicate of the Sword Sage's disciple, manifesting as a pink-skinned, red-haired entity with six metallic blade Goldsigns and a pink-bladed sword in Underlord. By Uncrowned, the Shadow has evolved into a more autonomous crimson spirit that wields a black sword and produces unsettling, swamp-like laughter, demonstrating growing independence from its host. Across these books, the Blood Shadow transitions from a mere reflection of Yerin into a distinct, increasingly self-aware entity that challenges the boundaries between parasite and partner.