I'll assume you meant Intelligence and go from there.
Hercules having an 18 Intelligence is the result of him having too high a stat, rather than having a stat be too low. If Hercules' Intelligence ends up too high... well, it's like wearing a sweater on a warm day - you can just take it off. But if you penalize his Intelligence too heavily, you end up not wearing a sweater on a cold day and have the potential to ruin the whole day.
I'm telling you what I think will save this whole debate from flaming ruin. A simple factor would work better than a flat penalty. Here's why: a factor means that everything is decreased proportionally. Hercules would be 3/4ths as intelligent as he could be were it not for his dedication to Strength, or half as much depending on the number of times he took the Strength portfolio. A flat penalty could leave people having to lower characteristically important scores (like lowering Hercules' Strength or Con) in order to compensate for crippling weaknesses in other scores like Intelligence or Wisdom.
If using the aforementioned idea leaves Herc with an 18 and his designer thinks it's too high, well 1-for-1 it to another score; at least it's not lowering other scores that might be important to make up for the imbalance.
Like I said, wear a sweater on a warm day and you're fine. Leave it home on a cold day and you'll be cursing your ill luck... especially when you designed the weather patterns.
Hercules having an 18 Intelligence is the result of him having too high a stat, rather than having a stat be too low. If Hercules' Intelligence ends up too high... well, it's like wearing a sweater on a warm day - you can just take it off. But if you penalize his Intelligence too heavily, you end up not wearing a sweater on a cold day and have the potential to ruin the whole day.
I'm telling you what I think will save this whole debate from flaming ruin. A simple factor would work better than a flat penalty. Here's why: a factor means that everything is decreased proportionally. Hercules would be 3/4ths as intelligent as he could be were it not for his dedication to Strength, or half as much depending on the number of times he took the Strength portfolio. A flat penalty could leave people having to lower characteristically important scores (like lowering Hercules' Strength or Con) in order to compensate for crippling weaknesses in other scores like Intelligence or Wisdom.
If using the aforementioned idea leaves Herc with an 18 and his designer thinks it's too high, well 1-for-1 it to another score; at least it's not lowering other scores that might be important to make up for the imbalance.
Like I said, wear a sweater on a warm day and you're fine. Leave it home on a cold day and you'll be cursing your ill luck... especially when you designed the weather patterns.