So these entities hide in the dark. They are small and have a creepy child laugh. One you hear it laugh you know it’s near. This entity finds someone (or an oc) with negative emotion and this entity makes a creature out of its negative emotion. The stronger the emotion oc the person the stronger the creature it will be. Once the masked entity finds someone, it’s face turns into a mask and the person forcefully gets the mask on and it creates the creature based on there emotion.

I’ll add more later