Bombs fire from the position of your Hero, outward in an orthogonal direction (not diagonal).
What is the range of a given Q power?
If not specified, the default range is 7.
With Nim’s ability (wind that pushes all heroes 2 spaces in a random direction as determined by a roll of the direction die), how do I resolve a NW or SE or similar diagonal roll?
For diagonal directions that aren’t tumbled simply move directly diagonally.
If a hero (e.g. Ember) explodes using his ability, does he stay where he is or does he need to respawn?
Hero explosions are focused on the exploding hero, effectively catapulting them straight up. Hence, they stay in place after the explosion. No they don’t respawn.