Arrow of Bone

You scribe runes of dire power on a single missile or thrown weapon (usually an arrow, bolt, dart, javelin, or spear), changing the weapon into a sinister missile of cold, enhanced bone. When thrown or fired at a creature as a normal ranged attack, the weapon gains a +3 bonus on attack rolls and damage rolls. In addition, any living creature struck by an arrow of bone must succeed on a Con save or take 3d6 points of necrotic damage. A creature that makes its save instead takes half of the damage. Regardless of whether the attack hits, the magic of the arrow of bone is discharged by the attack, and the missile is destroyed.