GMforPowergamers
Legend
The ogre has an 18 str... Maybe gantlets of ogre power give an 18 str
Not only would I keep the ability score cap at 20, I would go two steps further.
Step One: I would apply racial modifiers to the limit of 20. Humans, having no racial modifiers, would max out all skills at 20. Dwarves, having a +2 racial bonus to Constitution and a -2 racial penalty to Charisma*, would max out at 22 Con and 18 Cha. That way, even the sweetest and most charming maxed-out super-dwarf will still be less charismatic than the sweetest and most charming maxed-out super-human.
Step Two: I would rule that no amount of level advancement, training, magic, divine intervention, wishes, or miracles can increase your ability score higher than your racial limit. A belt of giant strength +4 can raise your wizard's Strength from an 11 to a 15, but it won't do anything at all for your fighter if his Strength is already 20.
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*AFAIK, we don't have exact stats on racial modifiers yet. So I am borrowing the ones from 3.5E for this example.
I'd prefer ability-based advancement ("I grow stronger" makes a lot more sense than "My attack bonus gets better, even though I'm just as strong as I was one level ago"), but if it causes problems, sure, cap it.
So they're much more useful for the guy with 12 Str than 16 Str?The ogre has an 18 str... Maybe gantlets of ogre power give an 18 str
With the flatter math, pretty much any score over 16 is going to qualify as a "high" score. If you wanted a sweet, maxed-out super-dex character, then any of the races would do (since they would max out at 20). I suppose if you wanted to have "OMG TEH BEST DEX EVAR LOL!!!1" character, then yes...a high-dex race like elf or halfling would be the obvious choice (with a max of 22.)Step one : Thats some pretty sexy stuff right there. I would be concerned about humans without any bonus though. If you want a high dex character, does it becomes an automatic choice to play an Elf?
So they're much more useful for the guy with 12 Str than 16 Str?
If you care about a level playing field, you'd presumably use a point-buy system for ability scores in the first place, which this type of item would break. The 16 Str guy had to give up other scores in order to be ahead of the 12 Str guy, and this item would make that tradeoff meaningless.Beyond that, it levels the playing field. If it's just a bonus, that 16 str guy would always be ahead of the 12 str guy. But by having a set score, they would be on equal footing, if both had them.