I don't know, however that description is actually not consistant as it talks about getting a to hit buff per opponent.
A flat 20% to hit buff is more useful, as that is basically enough for a 35% to hit buff 3 slotted. This is means you have an 83% chance of hitting with unslotted attacks against purple minions.
I've never seen an accurate value for the to hit buff of invinvcibilty, lots of testing was done for the defence, but I'm not aware of much on the to hit side.
@Unthing ... Mostly on Union.
I'm going to weep salty tears if the ToHit buff actually is the flat 20% base, as I used my freespec, and only slotted it for EndRdx/DefBuf/DefBuf/MembrExp (could've used a couple of more slots for TH_Buff then) 
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Oh NO!
Although if you are Inv/SS you have the option to completely drop accuracies. Rage gives a 20% to hit buff and so does Invincibility, so you can get a 62% to hit buff ( 31.2 each, my 35% buff figure was wrong because it is morning ) which is more than excessive, even for PvP ( although I probably would add 1 accuracy just for those overload defence powers ). If you get focussed accuracy ( 25% to hit buff IIRC )too the whole thing becomes even more excessive.
I know someone that has tested Invincibility and reckons they have around 30% against 1 enemy with it slotted with 3 to hit buffs, so it looks like it is likely to be around 20%.
I suspect for my next Golden Golem build I will try to live without accuracies.
@Unthing ... Mostly on Union.
Hmmm... I do have one last 'earned through doing the respec trial' respec left - it's rather tempting to respec back into a fully slotted defense and tohit buff Invincibility again 
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Good thing I'm at work now, so I can only do it 'on paper', so I don't potentially rush into doing something stupid 
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I wouldnt be too hasty without making tests for yourself.
He will honor his words; he will definitely carry out his actions. What he promises he will fulfill. He does not care about his bodily self, putting his life and death aside to come forward for another's troubled besiegement. He does not boast about his ability, or shamelessly extol his own virtues. - Sima Qian.
That's strange. I beat up 2 behemoths with Invincibilty on. With invincibilty and unslotted brawl I got an 82% chance of hitting. ( 200 hits )
Without invincibilty I got a 73.9% chance of hitting. So that just doesn't make sense. Maybe the Prima guide is wrong. ( about 185 hits )
Invincibilty had a hami O in it so was experiencing a 20% to hit buff. So the base is around 6.75%. I'm going to check with the person who found it was 30% 3 slotted.
This ahs been confirmed by Tiffany Seville who said she messed up a test and got 31 instead of 3.75.
@Unthing ... Mostly on Union.
Clicky for Invinc ToHit information
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Clicky for Invinc ToHit information
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Yes tiffany Seville got it wrong, see last post.
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it tested it yesterday and the ToHit buff from Invinc is indeed in the 20% range for Tankers with one foe in melee. i was getting about 30% with it three-slotted with even-level SO's.
well, strike that test result ... i messed up something in the numbers. i've also re-ran some older tests and i'm getting results much more in line with my findings from back in Nov last year, i.e. something more like a 3.5% to hit benefit for one foe in melee.
i'm going to do some more work on this and will let y'all know what comes of it.
sorry for the confusion!
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Which means you should ignore my previous calculations they are wrong.
@Unthing ... Mostly on Union.
Ahh, I'm happy and slightly disappointed at the same time... but at least I've still got my respec, hehe .
Straight (or well... relayed) from the horse's mouth; http://boards.cityofheroes.com/showf...umber=5758066.
While the Invulnerability numbers in the Prima guide update are Brute numbers, I doubt there's a difference in how the powers work between the sharing ATs.
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Invincibility 27 Toggle 100% 0' 0.208 0 3 10 8' 0° 10
BOOSTS ALLOWED: Endurance Discount, Recharge, Buff Defense, Buff To Hit, Taunt POWER HELP TEXT: While this power is active, for each nearby foe in melee range you receive a bonus to Defense against all attacks but Psionics, and a bonus to your Accuracy. This power is most effective while fighting multiple
opponents. The first foe you engage in melee grants the highest Defense bonus, and up to 10 foes can contribute to your Defense and To Hit Bonus. Recharge: Slow EFFECTS: 20% To Hit increase; 3.75% Defense versus all attacks except Psionic; additional 1.1% Defense versus all attacks except Psionic per target.
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Is this really how it works now (instead of the frontloaded 6% buff for the first foe in range and then 1,5% for the rest up to a total of 10 foes, as per the SherkSilver planner)?