Borda'Skira

This otherworldy dagger's blade is solid to the touch. When about to strike, however, the blade flickers like smoke, slicing through armor as if it wasn't even there. When making attack rolls with this weapon, Borda'Skira ignores all non-natural AC bonuses. The blade requires the blood of dragons to function. The more ancient and powerful the dragon, the more potent the weapon becomes. Each strike uses up a portion of the blood stored inside. Without dragon blood, the dagger's blade evaporates.