Potion, very rare
An arrow of slaying is a magic weapon meant to slay a particular kind of creature. This arrow is specific for fiend creatures. The creature must make a DC 17 Constitution saving throw, taking an extra 6d10 piercing damage on a failed save, or half as much extra damage on a successful one.
Once an arrow of slaying deals its extra damage to a creature, it becomes a nonmagical arrow.
Other types of magic ammunition of this kind exist, such as bolts of slaying meant for a crossbow, though arrows are most common.
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