Boros shows up one day and begins carving a swath of destruction on 616 Earth, much similar to how he does in OPM. There is no warning and he begins in New York City. How much does he destroy before he is stopped and how is he stopped? What sacrifices would be made?
Scenario 1: Boros alone, no help from his lieutenants or ship. People like Thor can be called in by Earth but they'll need to travel there first before engaging Boros.
Scenario 2: Same scenario except now Lord Boros has the assistance of Melzargard, Groribas, Geryuganshoop and his ship.