The way I understand it:
ToHit affects your player as a whole. Accuracy is part of the power itself. Both are used when deciding if your attack "hits" it's target.
If you increase the Accuracy of a power, then that power has a higher chance of "hitting", whereas if you increase your ToHit, then ALL* your powers will have a greater chance of "hitting".
When a power says it gives the enemy -ACC, I believe it's actually reducing the foe's ToHit... much like when CoT hits us with [Gloom]'s -ACC, and the Combat attributes shows a ToHit decrease, which affects the overall accuracy of ALL* our powers.
*except for powers that "ignore buffs"
Also the counter to "to hit" is defense.
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If you're talking about IO set bonuses, those can increase Accuracy globally. Basically, the formula looks like:
HitChance = Clamp( AccMods × Clamp( BaseHitChance + ToHitMods – DefMods ) )
Where 'Clamp' keeps it above 5% and below 95%. For most powers, having around 60% accuracy enhancement slotted in them is generally enough for most enemies. With some ToHit buffs on your character, you'll need less accuracy enhancements.
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Originally Posted by ShadowNate
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Although, to be fair - some powers give global +ACC.|
Originally Posted by Master-Blade
ToHit affects your player as a whole. Accuracy is part of the power itself.
If you increase the Accuracy of a power, then that power has a higher chance of "hitting", whereas if you increase your ToHit, then ALL* your powers wil have a greater change of "hitting". *except for powers that "ignore buffs" |
The main difference is how they affect your character.
To Hit is the value compared/subtracted by your target's defense (and then set to min. 5% and a max of 95%). The resulting number is multiplied by the power's accuracy mod - so +To-Hit is always more effective than +ACC if you have a choice.
Wiki Article on it
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There is a complex set of mechanics behind "To Hit" and "Accuracy."
To oversimplify only a little, as my high school physics teacher used to say, you have (Base To Hit + To Hit Bonus - Defense) * (1.0 +Accuracy) .
Base To Hit starts at 75% and goes down against higher level enemies.
Against an even-con enemy, with no Defense, 33% Accuracy ("one standard SO") makes the formula 75% * 1.33, or just about 100%. You always miss 5% of the time, you always hit 5% of the time. (Like I said, I oversimplified...)
I think against a +3 enemy your Base To Hit is about 56%. Don't quote me on that, I could be wrong. The same 33% Accuracy would put you up to only a 74.5% final chance of hitting.
Adding a 10% To Hit bonus turns that 75% into an 85% in the first case, and the 56% into a 66% in the second case.
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Originally Posted by Dispari
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Many thanks, all. That's exactly what I wanted to know, and the links provided to elsewhere for even more detail were much appreciated, too.
Can someone explain the difference between ACC Mods and To-Hit Mods? I know they are different, but since I don't know ecactly how, it's hard to choose between a +ACC or a To Hit Bonus, or the reverse if talking about a debuff.
Thanks in advance.
Maddy