Serpent arrow

Serpent arrow was an arcane, transmutation spell that transformed normal mundane projectiles, such as darts, arrows or crossbow bolts, into flying vipers once they achieved flight.

Effects
Upon casting this spell, the caster imbued up to eight missiles with the potential to morph into small, venomous snakes, for a duration of at least an hour.

The projectiles were completely mundane until fired, after which they morphed into a small viper, and remain in that form until the end of the spell's duration. These serpentine creatures would continuously bite whomever would have been struck by the projectile, or if it missed, whomever was closest to them upon landing. The snakes could be directed by the caster to attack a target of their choice, injecting them with venom upon every successful bite.

Casting
The material component for this spell was a scale from any species of snake.