It's a fantasy role-playing game.

DM: You are Scanlan Shorthalt, a gnome bard . You are the member of the famous group of adventurers. Previously, Percy walks up to the doors and tries to open them, but can't. Vax prepares to unlock it, but there isn't a lock; the doors are barred from the inside.
DM: With a brief burst of wind energy, a shimmering form, somewhat humanoid in shape, but still amorphous appears.
Player: Hi, Darrell.
DM: (wind sounds) and begins to shove itself up against the bottom of the wooden bar. Make your check, as well.
Player: That was a six. Is that for me?
DM: That's for you, and then roll and add five for your Unseen Servant.
Player: So, five extra to that is 11. Right? No?
DM: Roll again, add five.
Player: Oh, I see. Four. So that's a nine.
DM: The three of you, one mystically summoned from a plane beyond your own, cannot seem to budge this single wooden door! You've defeated beholders. You've slaughtered illithid underneath, in the Underdark, deep in the belly of the planet. But this door bests you!
