It exists so that you can make "Q dodger" jokes when against Ezreal, Dr. Mundo, etc.
*dodges enemy Q*
"Guess that makes me...a Q dodger! Ahahaha!"
Because "queue" sounds like "Q"...Yes.
Actual explanations above.
Strange. I don't know how else I'd get 600 damage with 160 base + 190ish from AP. The minions had -10 MR, but I think that isn't enough bonus damage to make it go from 400ish to 600. I'll play Vlad some more and check.