Fake Healer wrote:*How about surprise round? Does everyone participate in combat on the surprise round with the surpriser getting advantage on attacks and the surprised getting disadvantage?Again, no set rule that I know of. On the one hand, it makes mechanical sense, but it does step on the toes of the Assassin Rogue a bit, since he gets advantage against anyone who hasn't acted in combat yet. Limiting advantage to opponents who are actually surprised and only during the surprise round would probably be a decent compromise since the Assassin also gets it against anyone who's flatfooted, surprised or not.
Another rule to keep in mind is that hidden attackers gain advantage. So for example, I would rule that in a surprise round, ranged attacks get advantage against surprised opponents, because it's reasonable to interpret that being surprised = didn't see the person aiming the ranged weapon.
For the same reason, I might rule that melee attacks sometimes get advantage in a surprise round, but only in a close quarters situation where the attacker can reasonably "step up and swing" without being seen first. But if the attacker has to cover significant distance before attacking, I would rule that he's not hidden and therefore not eligible for advantage.