Yeah, that's more a case of "rules the designers got wrong".
"You walk into a room. There is an invisible stalker standing motionless and silent in the corner" sounds pretty
ing stupid...
If it arrived in the room mere seconds before the party, it may not have had time to slow and quiet it's breathing. If it arrived a while ago, it did have time. Still need a stealth check to determine how well it is hiding, because Invisibility doesn't
automatically mean you are hidden.
I don't know where the "PCs know where you are if you haven't taken the hide action even though you are invisible" comes from. Jeremy Crawford
just clarified in a podcast that it's not true, nor is it the intent. There's a thread on it right
here
If the invisible stalker is singing a bawdy tavern tune you probably know where it is. But sitting in the corner quietly? It's a DMs call, and normally will not be noticed.
Well, firstly, it comes from the fact that not everyone on the forums reads every thread or listens to podcasts, so yeah, he
just clarified it. Expecting everyone to know about it
immediately is supremely unreasonable.
But what still needs to be said on the subject here, is that people who are ruling Invisible creatures to automatically be hidden simply because they are invisible
are still wrong, or houseruling it.
In the example used in a thread a while back, if you you run into a room, pursued by enemies, and turn invisible, that doesn't mean you are hidden when, in the same round, enemies come into the room. You aren't. They can hear your heavy breathing, and can try to attack you. If you're fast enough, and have time to take an action to make a Hide Action Stealth check, you are then hidden, as long as your check exceeds their Perception checks.
I kept your choice bits.
Wow...
That's all I've got for you.
Yeah, Saelorn has a very rigid, very specific, and very unusual sense of how the game works. Pretty sure, by their book, you are literally not playing a role playing game.