I just got curious. Arrows seem to be working as a direction of an attack of a unit.
What decides the direction of arrows after deploying heroes and creeps?
It seems they are randomly decided. From what I've heard, there's a 50% change of getting a straight arrow and another 50 for left and right(25% each)
Cool, but what happens if there's no unit in the direction of an arrow? would it miss the combat phase?
I think it hits the tower directly.
then it's one of the RNG elments in the game?
Yes. I would't say it would make the game ever so unpredictable, but it can influence the outcome of the match.