Direbats Mod

Direbats adds a new mob into Minecraft. As the name suggests, this mob is called the Direbat and they only spawn during full moons. They usually do not attack players, but they will become hostile if they are exposed to light or if they are taunted by a player. Any player that has been attacked by a Direbat gets inflicted with a blindness effect. Killing a Direbat will drop it's fangs, that you can use to craft fang arrows, that will inflict a blindness effect to the target. 

This mod offers versions for both Forge and Fabric. Download links are given below.