What is the "best" 4th level spell for a damage-spec'd Sorc? I'm thinking either Wall of Fire or Phantasmal Killer. I'm probably leaning towards Wall of Fire since I have enhancements for elemental damage... but the thought of insta-killing via PK is pretty exciting!
Re: Firewall, do enemies continuously take damage if they stand within it and/or pass through it multiple times? Or is it a one-shot hit?