Miss Chance calculation
Posted: Fri May 22, 2015 5:38 am
wowwiki.com wrote:The difference between the attacker’s Attack Rating and the defender’s Defense determines the chance to miss a melee or ranged attack. When a player or mob attacks a player, the chance is a base 5% plus 0.04% per rating difference. Level is not a factor except when attacking a mob level 9 or lower. Miss chance against a low-level mob is a percentage of normal equal to the mob’s level divided by 10. When a player or other mob attacks a mob, the change in miss chance is 0.2% per rating difference if that rating difference is 11 or more. If the rating difference is 10 or less then the change in miss chance is 0.1% per point. If the attacker and defender have the same ratings then of course the total miss chance will be 5%.
Source: http://www.wowwiki.com/Miss?oldid=821897
Some developer has changed something with the defense vs. weapon skill formula recently and it is making a slight difference in endgame PvE content and a huge difference in my ability to solo farm lower level dungeons. Mobs that are excessively below a player's level are able to hit in melee with very high frequency. I did some tests after getting wrecked by mobs in level 40+ dungeons that I could normally solo with ease and found that the miss chance calculation from defense is using the default multiplier of .04% miss chance per +1 defense skill. However, when the difference between weapon skill and defense is greater than 10, the multiplier should be .2% per defense skill above the attacker's weapon skill. This change has such a detriment on gameplay that melee classes would now have 2.4% more hit chance against raid bosses than previously. For instance, I let a level 7 mob in Dun Morogh hit me about 720 times from behind and the statistics that Recap compiled was that the mob had a 15.7% miss chance. If we use the WRONG multiplier here, the miss chance that we calculate is 5% (base) + [ 300 (my defense skill) - 35 (mob weapon skill) ] * .04% = 15.6%, which is approximately what I discovered. Using the CORRECT multiplier the miss chance would be closer to 5% + (300 - 35) * .2% = 58%.
Please fix this ASAP. It is a major bonus to melee player damage in raids and quite silly that a group of 3 melee players that are 20 levels below me can hit a level 60 player with ease because this server has incorrect mechanics.
Edit: Actually, some information in this post can be ignored. The formula was for players vs. mob only from what I can find but I really wanted to open up discussion just in case players are noticing their ability to hit higher level mobs at a consistent rate. I currently cannot find any information about mob vs. players that would suggest additional miss chance based on level difference or the weapon-skill/defense difference. I suppose that I have been spoiled by the private server experience over the past 7 years. It seems to be working as intended when mobs attack players until I can find other sources that state otherwise. However, it is a good idea to keep a watch on hit/miss statistics against higher level mobs to monitor the effect of this change in PvE.