Bone-tar

Bone-tar emerges in The Name of the Wind as a mysterious and volatile substance, a dark caustic liquid that boils at room temperature into a heavy, oily black gas with mercury-like surface tension, igniting spontaneously into cascading sodium-red jagged flames that persist over a shroud of dark fog. Across the series, it remains a singularly enigmatic alchemical material, emblematic of the Chandrian's dread influence, with no further evolution or appearances in subsequent books, underscoring its role as a haunting harbinger of otherworldly peril. Its properties hint at deeper sympathetic bindings to naming and destruction, though its full secrets linger unresolved.