Mustrum_Ridcully
Legend
I hate that unless your a class that has abilities or powers based on int, int is a complete and total dump stat.
I've been racking my brain trying to think of ways to make int more generally useful without overpowering wizards, tactical warlords, and swordmages...and I'm really coming up empty right now.
Anyone have any good houserules they like to use for this?
I think there are no good houserules. Only Constitution and Dexterity have a special relevance due to the fact that Con affects hit points and healing surge and Dexterity affects initiative.
You could introduce more feats that rely on Intelligence. But I think this will just give Warlords, Wizards, Swordmages and Warlocks more choices, not change your average Fighter, Ranger, Rogue, Cleric or Paladin.
And if it does, maybe you just introduced something a little too powerful?
But I think that is not a real problem. It's no worse then Strength, Wisdom or Charisma. You will see "smarter" characters if you have more classes that also rely on Intelligence.
One thing you could consider is creating alternate class options that focus on a "non-standard" ability score. A "smart" Rogue (you know, like they used to be in 3E). Or a "smart" Fighter (like the Fighters I played - I needed Combat Expertise or rather Improved Trip). But this would still require someone to play that specific character build.
The only reason INT was not a dump stat for most classes in 3E was because it affected your skill points. And that was a very powerful benefit, but it only worked since everyone had too few skill points to get what people think was "needed" - maxing skills and getting synergy bonuses.
If you don't want more skills trained, consider improving Jack of all Trades (how about a +3 bonus) and Skill Focus (that's a stretch).