Duiker wrote:
Well first of all, the knowledge DR is too low. It's supposed to be 10+CR as a rule of thumb or 15+CR if it's totally rare (I think, I know the first one is right, the second one is slightly hazy). So at level 12, you should be running into bosses a few CR above you, which is more like DC 25 or 30 just to know the thing's name, not DC 15.
Second of all, on the more general point, roll with it so to speak. Go into loving detail about how they succeed on these things. Tell the bard how he has actually read the Collected Studies of Lich Research by Edmund the VII, a thousand year old tome that details all of this info.
Start looking for ways to give additional difficult options. Performing is at +25? Sure, you can not even roll to get free drinks at every tavern, but have you tried singing a song so beautiful that a battalion of orcs stops what they're doing and starts sobbing? Or sang such a rousing song of courage that the townsfolk clamor out of their village and hit the enemy from behind?
The problem is that at high levels your skills give you superhuman abilities for all intents and purposes, but you're still testing the players against the mundane. Don't take the mundane successes away from them, but make it clear that skills that high open up new options DC40, DC50 things that aren't even considered at lower levels.
I agree with this guy in that the DC's should account for high level play. Max ranks in a class skill at level 12 with a 20 in that ability is a +20 right off the bat, skill focus makes it +26, and if they have a class ability associated with it then fuhghet about it. I would rather reward that instead of "fixing" it. Gotcha DM'ing is how you know you're dealing with a child, but be mature enough to indulge their momentary delight even if your character dies, for there is another to take his place that's even worse than the last (Muah hah hah ha ha).