Attack someone from behind results in a reward of gaining bonus. Wearn\ing heavy armor will give you a penalty to your attack, although you can protect yourself very well in the way. You only get benefits when you attack someone from behind. In battle, you try to maneuver yourself behind an enemy. This applies to both players and monsters who can gain a significant damage bonus by hitting someone from behind. When you read this, or you have found this strategy by yourself, you want to attack players from behind, at the same time you should also pay particular attention on people around you to avoid being hit from behind.