Tincture of the Grave-Walker

A small, hand-blown glass bottle of Viking craft, lying on its side upon a damp, cobbled dungeon floor. It is sealed with a heavy blue wax stopper. Inside, a thick, cerulean liquid swirls with an inner light, filling the vial halfway. The glass surface is etched with faint, spider-web runes that pulse with a cold, necrotic light.