Crown of Vermin

After casting crown of vermin, one thousand venomous, biting and stinging spiders, scorpions, beetles, and centipedes erupt from the very air around the character. This swarm forms a living aura around the character to a radius of 10 feet. The character is immune to his or her own crown of vermin. The swarm goes where the character goes at his or her speed, even if the character takes to the air or water. You gain 50 temporary hit points. Each vermin in the in the spell's area bite a creature who enters the area occupied by the effect. Every creature inside the spell's area must make a Dexterity saving throw. A target takes 10d12 piercing damage on a failed save, or half as much damage on a successful one.