DEPRECATED! This information has changed as of patch 3.1. Please see the updated page about hit rating.
Unlike melee combat, it seems that spells are on a two roll system for hit and crit. The system rolls once to see if you hit.. and then rolls again to see if you crit. This means that if you can’t hit, you can’t crit. The number one easiest way to increase your DPS is to cut down on the number of spell misses(which is different from “resists”).
Your hit rate is a combination of your level vs the mob’s level with hit rating sprinkled over it. Miss rates are different in PVP.
In the bad old days casters could only ever get to 99% hit rate on spells. There used to always be a 1% chance for the mob to resist. In patch 3.0.2 this 1% always-miss was removed.
Suppression, a talent at the top of the affliction talent tree reduces your chance to miss with Affliction spells by 1% per talent point (up to 3/3 for 3%). Note, this only effects Affliction spells. Your Destruction and Demonology spells will be unaffected.
Cataclysm, a talent at second tier of the destruction talent tree reduces your chance to miss with Destruction spells by 1% per talent point (up to 3/3 for 3%). Note, this only effects Destruction spells. Your Affliction and Demonology spells will be unaffected
NOTE: Neither of these talents effect demonology. Soul Shatter is a demonology spell. There’s really nothing worse than using Soul Shatter.. and having it resisted.
Seed of Corruption
Curse of Weakness
Curse of Agony
Curse of Recklessness
Curse of Tongues
Curse of Exhaustion
Curse of the Elements
Curse of Doom
At 70, 12.625 hit rating = 1% hit
At 80, 26.23 hit rating = 1% hit
In her skivvies (with neither suppression nor cataclysm), at level 80 Lilac’s spells will hit a level 80 mob 96% of the time.
This means she needs to “make up” 4% of hit. That’s 105 (26.23*4) hit rating for her to never miss.
In her skivvies (with neither suppression nor cataclysm), at level 80 Lilac’s spells will hit a level 83 mob (or skull level boss mob) 83% of the time. This means she needs to “make up” 17% of hit. That’s 446 hit rating for her to never miss (26.23*17).
If Lilac has 3/3 in suppression then her Affliction spells will hit a level 83 mob 86% of the time. Her Destruction and Demonology spells will still only hit 83% of the time. In order to reach 100% with her affliction spells she’ll need to get 368 hit rating (14*26.23). At that point her destruction and demonology spells will be at 97% hit rate.
If Lilac has 3/3 in suppression and 3/3 cataclysm then her Affliction and Destruction spells will hit a level 83 mob 86% of the time. Her Destruction and Demonology spells will still only hit 83% of the time. In order to reach 100% with her affliction and destruction spells she’ll need to get 368 hit rating (14*26.23). At that point her demonology spells will be at 97% hit rate.
In order to hit 100% of the time with all of her spells Lilac will need 446 hit rating. At that point she will no longer need to put any points into Suppression or Cataclysm for their bonuses to hit (these talents have other bonuses that may still make them worthwhile).