The Chronicles of Anglarthea - The Legend of the Sages Stone
Arrows of Slaying
Take a critter down with little effort
This +1 arrow is keyed to a particular type or subtype of creature. If it strikes such a creature, the target must make a DC 20 Fortitude save or die (or, in the case of unliving targets, be destroyed) instantly. Note that even creatures normally exempt from Fortitude saves (undead and constructs) are subject to this attack. When keyed to a living creature, this is a death effect (and thus death ward protects a target).
These arrows have been keyed to creatures of the underdark (Drow, Driders, Durgers, and things of those nature)