Hmmm, in that context it may not be overpowered in some circles. My comments assumed a free action, which is very powerful.
As a standard action its not too bad in most cases. I'm giving up the attacks and damage this round to obtain more benefit on the next round. Considering that, I think it would be okay to allow the bonus to apply to all attacks made on the following round.
But, the problem at low levels is still there. A low level character doesn't care that they only get 1 attack per round. You will take any kind of bonus they can get. The thing you have to consider is that based on core only spellcasters and monks get concentration as a class skill. However, there are many ways to get it as class skill, multiclassing, cosmopolitan feat, dm allowance, etc. You want to ensure its balanced no matter who could take it.
So the scale does need to change, but in a different way they I orginally proposed. For example, how about Base DC = 15, with +2 per bonus. So a +1 to attacks would be DC 17. At 1st level, let's go with our standard +6. That means he's only getting a +1 slightly less than half the time, which is fine for the investment in skill points. The maximum he can do is a 26, which is a +5. That's a lot.
I would throw in a condition that says you can't get a bonus higher than half your ranks in concentration. So, the best a monk at 1st level can do is get a +2. For low levels, that's perfectly reasonable. And from a monk's perspective, he's giving up flurry of blows in order to potentially get a bonus. But it could net him a +4 overall (+2 from the skill, +2 for not flurrying) which is again a hefty bonus at low levels.
Looking back at a midrange perspective lets take a look at 10th level. We have a monk with 18 wisdom, max concentration for a +17. His max bonus is +6, due to the half ranks rule. On average he will recieve that max of +6, with a minimum of +1. But he did give up all his attack from the last round, and spent a number of points in concentration. I think that's not too bad.
Now a 10th level fighter with cosmopolitan or some other means of getting concentration. We will say its also +17, lowering wisdom but might have a skill focus or something in there. On average that's +6 to attacks, which translates to +12 with Power Attack. Pretty good, but again his minimum is a +1, its a gamble, especially when you give up the powerful blows of a fighter for the chance. I don't think that's too bad either.
Taken to the extreme, 20th level monk with 30 wisdom and max concentration. His bonus is +33. His maximum possible bonus is a +12 due to ranks. At such a level, I don't such a bonus is out of the question, especially since many players will have insight bonus through some manner.
As a standard action its not too bad in most cases. I'm giving up the attacks and damage this round to obtain more benefit on the next round. Considering that, I think it would be okay to allow the bonus to apply to all attacks made on the following round.
But, the problem at low levels is still there. A low level character doesn't care that they only get 1 attack per round. You will take any kind of bonus they can get. The thing you have to consider is that based on core only spellcasters and monks get concentration as a class skill. However, there are many ways to get it as class skill, multiclassing, cosmopolitan feat, dm allowance, etc. You want to ensure its balanced no matter who could take it.
So the scale does need to change, but in a different way they I orginally proposed. For example, how about Base DC = 15, with +2 per bonus. So a +1 to attacks would be DC 17. At 1st level, let's go with our standard +6. That means he's only getting a +1 slightly less than half the time, which is fine for the investment in skill points. The maximum he can do is a 26, which is a +5. That's a lot.
I would throw in a condition that says you can't get a bonus higher than half your ranks in concentration. So, the best a monk at 1st level can do is get a +2. For low levels, that's perfectly reasonable. And from a monk's perspective, he's giving up flurry of blows in order to potentially get a bonus. But it could net him a +4 overall (+2 from the skill, +2 for not flurrying) which is again a hefty bonus at low levels.
Looking back at a midrange perspective lets take a look at 10th level. We have a monk with 18 wisdom, max concentration for a +17. His max bonus is +6, due to the half ranks rule. On average he will recieve that max of +6, with a minimum of +1. But he did give up all his attack from the last round, and spent a number of points in concentration. I think that's not too bad.
Now a 10th level fighter with cosmopolitan or some other means of getting concentration. We will say its also +17, lowering wisdom but might have a skill focus or something in there. On average that's +6 to attacks, which translates to +12 with Power Attack. Pretty good, but again his minimum is a +1, its a gamble, especially when you give up the powerful blows of a fighter for the chance. I don't think that's too bad either.
Taken to the extreme, 20th level monk with 30 wisdom and max concentration. His bonus is +33. His maximum possible bonus is a +12 due to ranks. At such a level, I don't such a bonus is out of the question, especially since many players will have insight bonus through some manner.
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