Even if they have no defense, your base chance to hit them is 75%. Without any accuracy enhancement, the defense debuff is still doing something.
The problem with Defense Debuff is mostly that it requires a to-hit check to actually do anything. If you can hit your target, you don't need the debuff. If you can't hit your target, you can't land the debuff to help you.
EDIT: I am more than aware of the autohit defense debuffs. I assumed since he was talking about Acc IOs, he was referring to defense debuffs that required tohit checks.
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True, except in the case of autohit powers like Radiation Infection. The best Defense Debuff power in my opinion, because it is one of few that don't require you to hit them first.
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Originally Posted by Dechs Kaison
Even if they have no defense, your base chance to hit them is 75%. Without any accuracy enhancement, the defense debuff is still doing something.
The problem with Defense Debuff is mostly that it requires a to-hit check to actually do anything. If you can hit your target, you don't need the debuff. If you can't hit your target, you can't land the debuff to help you. |
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Originally Posted by Dechs Kaison See, it's gems like these that make me check Claws' post history every once in a while to make sure I haven't missed anything good lately. |
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If you have enough def debuff, you could skip accuracy enhancements. You just better be sure that you'll have that debuff available every time you play that toon. Also, what if you have multiple enemies and some are OUTSIDE the debuff area?|
Originally Posted by TankShock
Reading some of the guides has me a little confused. Does debuffing def help at all if the target has no def to begin with? I'm not sure how debuff def can let you skip Acc/ToHit mods (or IO's). Fewer maybe, but not totally skip. Thanks.
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BTW, resistance debuff works fine also on enemies with 0 resistance. It gives them NEGATIVE resistance which means they take extra damage. This is how you can effectively get more damage out of vet powers. You're not buffing your attack; you're debuffing enemy resistance. You can have your vet powers do double damage or more by debuffing the enemy resistance.
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So def debuff can give negative defense? -20% debuff on a mob with no def would cap your to-hit?
Now I really don't understand why my Rad ever has trouble finding a team. 
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Yeah, -20% defense would cap your tohit against even con enemies. The issue is that a vast majority of the population is already slotted to cap tohit against even con enemies. It only takes one SO.|
Originally Posted by TankShock
So def debuff can give negative defense? -20% debuff on a mob with no def would cap your to-hit?
Now I really don't understand why my Rad ever has trouble finding a team. |
If you're talking about radiation blast, you can't really skimp on accuracy because you need to be able to hit the first time. Again, this is the reason -def is largely useless.
If you're talking about Radiation Emission, then your radiation infection is auto hit, and pretty much floors enemy defense. Here you could skip accuracy slotting all together if you could ensure that all your enemies stay within the debuff. Even fighting +1s and +2s, this won't be that noticeable because of how easy it is to hit things in this game. When you get to +4s, however, it's a different story. When you get to AVs, it's another different story, because they resist 85% of your defense debuffs.
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Claws is right, Radiation Infection is autohit. So is Earth Control's Quicksand (25% Defense Debuff). There are probably a few others. The Defense Debuff in Freezing Rain and Sleet is practically autohit since it has so many chances to hit, and then the debuff gets applied.|
Originally Posted by Dechs Kaison
Even if they have no defense, your base chance to hit them is 75%. Without any accuracy enhancement, the defense debuff is still doing something.
The problem with Defense Debuff is mostly that it requires a to-hit check to actually do anything. If you can hit your target, you don't need the debuff. If you can't hit your target, you can't land the debuff to help you. |
Another effective use of Defense Debuffs is to counteract ToHit Debuffs from foes. And many people don't have Accuracy slotted to the max and often go up against higher level foes, so some Defense Debuff is useful. It also helps the Vet and temp powers hit more reliably and helps pets. However, in most cases, while some Defense Debuff does some good, a lot of Defense Debuff doesn't have much of an effect other than against AVs.
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Reading some of the guides has me a little confused. Does debuffing def help at all if the target has no def to begin with? I'm not sure how debuff def can let you skip Acc/ToHit mods (or IO's). Fewer maybe, but not totally skip. Thanks.