The Clavells are a small faction distantly linked to the Larson family but that was way back in feudal times.They used to be direct vassals until the clan moved on throughout the world. Maybe Adam came to Dalton after seeing a portrait of the Larsons' son.
All Vampires have the power to hear thoughts and send psychic signals to other vampires. If they're strong enough, their messages can cross continents.
Everyone is at Dalton to learn to get along with other clans and to learn much about their powers and history.
The Vampires at Dalton feed off the day students.
Pain infliction. Can cause unbridled excruciating pain, but limited to one body part per cast. Further concentration needed to hit multiple.
Logan likes the idea of using Dwight's powers to make everyone stop fighting. He tried to convince Derek to go punch Dwight in the face, despite Derek not liking that idea. Instead, Adam overheard and locked eyes with Dwight, snapped his fingers and set him off. The earth began to shake, the sky darkened, lightening cracked and the earth rocked more. This continued until Kurt stopped time, saw Adam and went over, pushing Adam to the ground. Kurt then ran back to Dwight and hauled him into Blaine's barrier. Everyone was then ordered back to their houses.