Jason wrote:how do you evaluate when they found out the weakness?
So you clearly agree that knowledge skills in D&D or anything like it are bullshit skills... but hey there is a
mystery monster hunt game of indeterminate rules and structure that maybe they might be important.
First of all.
Who cares. But second of all the only mystery monster hunt game that gets to make content gating rolls AND keep them important is one which is rules lite to the point that your combat event resolution is similarly brief.
What you are vaguely and confusedly mumbling about is a game with much the same constraints as a fairly standard action oriented RPG.
And as such you have a severe issue before you even get to the knowledge checks because
gimmick monster weakness/invulnerabilities are a major RPG design hazard.
Is knowing the weakness actually vital to defeating the monster? In your referenced source material it absolutely 100% is. That is
really kinda bad in an RPG. But regardless, you know what, at that point, YES you DO have to hand it to your players. You have
no choice but to do so, and you WILL do so, no matter how many rolls it takes it's all irrelevant in the end the players WILL learn that the monster can only be defeated with a golden teaspoon or whatever bullshit.
In the mean time though lets be clear. A
good RPG/Story does NOT do what Steven King's IT did and have the
Mary Sue Steven Sue Lead Twat just think about it and suddenly declare that in his heart of hearts he knows the demon spider is immune to guns and vulnerable to silver.
In a good story or RPG the PCs
decide they need to look for monster weaknesses (ideally after a non-fatal event/encounter/discovery demonstrating monster strengths/invulnerabilities). They then go to a place or person or whatever that might reasonably hold such information.
In a typical information gathering system that the pro-roll-every-fucking-thing faction would like this means you go to a library, and lets just say this IS the library the GM decided to place the important information in, BUT even though they made the right decisions... they roll low on a Research check and
get nothing and go nowhere.
At this point it is either
game over because they failed the star trek trivia check, OR... you make the failure not matter by making the information available
againg and again until a roll damn well succeeds.
Or you know, alternatively the monster weakness isn't actually anything more than a minor advantage and the party can just win with extra explosives or routine combat antics and none of the research phase particularly mattered anyway.
Nothing about your deep desire in your heart to replicate a god damn
buffy sucky mopey the vampire slayer episode changes the constraints on your knowledge type checks. Either they at best create minor unimportant variations within level appropriate challenges OR eventually the information they are hiding MUST somehow be provided.
Every single time we come back to this. Either the results matter, OR the rolls don't.