(Please forgive the uninspiring topic title)
I have a few questions about knowledge skills.
In my group, there's always one character that has very high knowledge skills, all of them. They can easily roll 20+. I'm talking about bards, investigators and wizards. There could be more classes.
The problem I'm having as a GM is that I don't know what I should tell them when they roll knowledge skills. I feel like I'm telling them way too much. Which makes my story weaker, since I want them to discover mysteries etc. on their own. A bit like the Lovecraftian/Cthulhu franchise.
But I also don't want to punish them for putting ranks in the knowledge skills.
When they roll high on a knowledge check when encountering a monster, should I just give them the bestiary?
When they roll knowledge checks on a large forest they have to go through. Do I tell them every creature, disease, food and hazards they could encounter?
And the big problem I'm having with my current campaign is; When is this knowledge updated?
In example: The group enters the capital of a country. They roll knowledge checks about the government/kings and the like. They know that a queen is ruling this city.
Well, in my campaign that queen has been missing, for a day. So for them to figure this out, they have to "gather information." Which is in the diplomacy skill now?
What if the queen has been missing for a week? Or a month? When does it stop from being a gather information check, to being a knowledge check?