What you worry about has nothing to do with what metagaming is or is not, though. Players can enjoy fighting Vrocks like a pro even if their character should have no clue that the vines growing out of the spores are harmless and eventually fall off, but it is metagaming to do so. If that is more important than letting low-level people fight homebrewed Vrocks to scratch a particular narrative itch, fine, make that argument, but don't say it's not metagaming, because it explicitly relies on metagame knowledge to happen.ModelCitizen wrote:Stubbazubba, worrying about the player's enjoyment of the game instead of the character's isn't metagaming. It's good game design and good DMing practice.
All of Kaelik's whining about CR 3 Vrocks boils down to the fact that it invalidates his meta-game assumptions. I'm not saying that's not important, I'm just saying it is the only problem with CR 3 Vrocks. You can totally play D&D with CR 7 gods and CR 3 Vrocks, so long as everyone is on board, and Kaelik even agrees with that. That shows that there are no intrinsic issues with CR 3 Vrocks.
So what is actually good DMing practice is to clarify expectations about the setting up front. Negotiate with your players until you agree to either go by the book (so they can rely on their meta-game knowledge), heavily home-brewed (so they can't and have to rely on in-character sources of information), or somewhere in-between (maybe they can ask if this is a MM monster or a home-brewed version).