Chance to Hit with Spells & Spell Hit Rating

#0 - Sept. 29, 2007, 3:01 p.m.
Blizzard Post
1. Base chance to hit with spells is affected by the opponent’s level.

Base Chance to Hit with Spell
vs +5 lvl 61%
vs +4 lvl 72%
vs +3 lvl 83%
vs +2 lvl 94%
vs +1 lvl 95%
vs +0 lvl 96%
vs -1 lvl 97%
vs -2 lvl 98%
vs -3 lvl 99%
2. Chance to hit with spells is capped at 99%. There is always at least 1% chance to miss.

3. Chance to hit with spells can be increased by talents.
• The warlock suppression talent increases the chance to hit with affliction spells by 2% (1pt), up to a maximum of 10% (5pts).

4. Chance to hit with spells can be increased by spell hit rating.
• Spell hit rating is a combat attribute found on gear items. A spell hit rating value will change the chance to hit with spells by a percentage. This percentage varies with the level of the player. A level 70 caster gains 1% chance to spell hit for every 12.6 rating points . Table below shows exact spell hit rating values and the increase in chance to hit with spells for a level 70 caster.

SH Rating@70 +%

0.00 +0%
12.62 +1%
25.23 +2%
37.85 +3%
50.46 +4%
63.08 +5%
75.69 +6%
88.31 +7%
100.92 +8%
113.54 +9%
126.15 +10%
138.77 +11%
151.38 +12%
164.00 +13%
176.62 +14%
189.23 +15%
201.85 +16%
5. Chance to hit with spells can be increased by external conditions. (List may not be exhaustive today.)
• Dranei casters give an additional 1% chance to spell hit to their group (Inspiring presence).
• Totem of Wrath increases the chance to hit and critically hit with spells by 3% to all party members if they are within 20 yards.

6. For PvE (TBC), raid bosses are considered to be 3 levels higher than a level 70 player.

7. A level 70 warlock attacking a raid boss will have 83% base chance to hit with spells, implying an increment of +16% is required to reach the maximum chance of 99%. The optimal spell hit rating for fighting raid bosses is therefore 202. A higher spell hit rating is useless for raiding.

8. Against raid trash (<lvl 73) - and assuming mixed level mob groups including lvl 72 mobs - the optimal spell hit rating is 64 (base 94% for lvl 72 + 5% from hit rating).

An example:
An affliction lock with 5/5 points in suppression (+10% hit for affliction spells) and a spell hit rating of 76 (+6% hit for all spells) will land 99% of his shadow DOTs on a raid boss. His shadow bolts (or his destruction spells) only hit for 89% however. All his spells will hit maximally (99%) against mobs of level 72 and lower.

Article is part of: Tuning Warlock Spell Hit
http://forums.wow-europe.com/thread.html?topicId=1015913291&postId=10157518942&sid=1#0
#2 - Oct. 2, 2007, 8:47 p.m.
Blizzard Post
A handy reference.
I have added this to the Mechanics section of the Informative and useful Warlock threads sticky:
http://forums.wow-europe.com/thread.html?topicId=305841010&sid=1