I played all of Death Stranding 2 with BOOBA written on my back because I thought it was funny.

obligatory pathfinder fixes that

pf2e has an action called recall knowledge that lets you roll to see if your character knows something about something. in this case, player could ask if trolls have any weaknesses, and roll a recall knowledge check using society (trolls are humanoid) and they might be able to learn about the trolls’ fire weakness

Combat damage is random and it’s still dramatic and exciting knowing everyone’s health. I think hiding death saves is better than hiding health though. Because in reality everyone would act super urgently seeing a friend collapse. When I’m DMing I explicitly say when things are bloodied (less than ½) and double bloodied (less than ¼) in addition to qualitative explanations.

I think there are numbers worth hiding, I just don’t think character health is one. Like I think stealth rolls should be hidden. You shouldn’t have an idea that you’re not hiding well.

Counterpoint, fire was historically used to drive away predators and is commonly depicted in movies as well. A random townsfolk may not know all the particulars, but put fire between the bad thing and yourself is a reasonable strategy for most monsters. It becomes a metagaming problem if it’s only done against monsters that don’t resist fire.

Plenty of systems have something for that, often with a variety of options.

A bookish Exalted character might roll Intelligence + Lore to remember having learned about the weakness to fire before. Or maybe Intelligence + Occult if the weakness is supernatural in nature. A combat-oriented character might roll Wits + War to deduce that fire is needed based on the knowledge of old battle reports involving trolls. Maybe even something involving Survival if they’re familiar with a region trolls can appear in.

A game with a flexible skill system has a lot of room for such things.

Oh, sure, you could absolutely make a case for your character accidentally stumbling on the right answer simply because fire is a good weapon, and a good roleplayer could use that to their advantage to metagame a bit more acceptably, but there’s a difference between that and just automatically grabbing fire stuff because you the player know it’s good against trolls.

Plenty of systems have something for that, often with a variety of options.

I believe 5e has a similar rule, but it seems rare for players to have actually read the rules. I don’t think D&D is especially detailed about this, but I don’t know where the book is to check. I don’t think they give DCs, where I wouldn’t be surprised if Pathfinder 2e had a simple “target number is 8 + the creature’s HD” formula with guidance on what to do for the range of possible outcomes.

Like I think stealth rolls should be hidden. You shouldn’t have an idea that you’re not hiding well.

I don’t have the players actually make the stealth roll until something opposes it. They’re doing the best they can. Here comes the guard. Roll, please.

I’ll take a meta gamer over someone with “my guy” syndrome any day. At least they’ll progress the plot.

My guy syndrome?

Iirc it’s a level DC based off of the monsters level

Some people just like rolling up new PCs ‍️

Without looking it up, I’m fairly certain that Arcana, Nature, and maybe even Survival checks can all be employed to fill this “character knowledge” confirmation, and have always been used for this and more. ‍️

Ah, okay then. Hadn’t seen it in that phrasing before. Pretty stupid as an idea though. The issue is not that someone wants to follow diagetic character motivations, or even that someone else wants to play with a focus on successful combat encounters regardless of diagetic knowledge. It’s that they both ended up at the same table. The DM fucked up by not setting expectations regarding the kind of table they were running. It is our duty as organizers of play to prevent these kinds of people from playing different games at the same table.

slightly neurotic diviner who almost always knows what’s optimal, and struggles between doing the obviously ideal thing or rejecting that and knowingly doing something suboptimal so they aren’t just a puppet to the magic

please tell me they experience different flavours from gems, like they’re candy, but the other party members keep trying to taste gems and it’s always just flavourless crystal.

and every now and then your sorcerer meets someone who shares their baffling ability to use gems as infinite gobstoppers, and they start enthusiastically chatting about what materials and cuts are best, as everyone else just looks on in confusion and exasperation

That’s how I did it when I DMed. On the off chance they need to make a check and I don’t want to alert them I just use passive or roll for them.

Yeah, this is the way.

We just fought a Troll in a Pathfinder session I was in. I’m playing an Athamaru (fish person) new to dry land, so I don’t have a ton of knowledge about stuff like fire. But the Druid hitting it with a fire spell, and the GM describing the way the Troll reacts is enough to naturally gain that knowledge on the spot. There are all kinds of reasons a character might not know even common monster weaknesses.

I think doing this kind of metagaming is important, because it gives opportunities for specific characters to stand out. If you have a party member with monster knowledge, it’s cooler for them to yell a warning, than it is for everyone to just act like they already know

It’s not just the GM’s responsibility. All the players at the table should be having those discussions throughout play