Hi peeps, I'm pretty new as a GM, please advise me on this one.
There's a magical door that can speak Common. Above the door is a phrase written in Common, etched into the stone. The only way the door will open is if the door speaks the phrase written above him.
I found this puzzle/skill challenge idea without context on the web, and thought it was kind of cool to put in one of my dungeons, but I feel it's surprisingly hard to watertightly design.
How should I go about hinting to the players that the door must speak out the phrase?
...Ideally they should come up with his on their own, but I want at least to have a method to confirm it if one the players suggests that this is the case, so that they don't waste too much time on figuring out the goal of this setup.
Is the door aware of the sentence it should not say?
What would be a good/fun phrase/set of words that is interesting for the door to get tricked into saying?
If the door needs to be bribed, what could a person bribe a door with? What would a talking door want to have?
The easiest and fastest solution for the whole thing in my mind, is if one of the player characters succeeds in charming the door with a fascinate or charm ability and compel the door to repeat what they say, like in a classic hypnosis.
But for the sake of exercise let's say the player who knows these enchantments is absent that session, how would this situation ideally play out?
Also, in case my players can't figure it out or get tired of trying, should I give my players the option of destroying/killing the door (with high difficulty) and get through anyhow, but give them some sort of repercussions for doing so?
EDIT: grammar/spelling