Just my opinion, but I think anything that would count as a mass casualty incident where multiple people were involved would be a class 4. Destructive energy beams shoot out of your eyes? 4. Can spawn a tornado to tear through a city block or a trailer park? 4. Able to regenerate from injuries that would kill another man and make blades slide out of your hand? 3. 


So, do cars in this alternate world still have wheels? What sort of tech might we expect?