Monstrosity-Slaying Arrow

•If a Monstrosity takes damage from the
arrow, that creature must make a DC 1 7 Constitution saving throw, taking an extra
6 d1 0 piercing damage on a failed save, or half
as much extra damage on a successful one.
•Monstrosities: frightening creatures that are
not ordinary, not truly natural, and almost
never benign-Kraken, Hydras, Basilisks,
Wurms, Dinosaurs etc.