It's a fantasy role-playing game.

DM: You are Taryon Darrington, a human artificer . You are the member of the famous group of adventurers. Previously, In the morning, while everyone else is taking breakfast, Pike checks the front door and finds about 20 skeletons waiting outside. She and Grog charge out to handle them.
DM: But inside the sphere. I understand. I will say, as is the nature of the spell versus a Dimension Door, I need you, as you begin to pass through, your form folds through the magic, the very powerful magic and intent of this sphere. The dome of red hits you immediately. I need you to make a dexterity saving throw, please.
Player: Two.
DM: Two.
Player: Oh, wait. Plus six. That's eight. Plus, I'm inspired.
DM: You can inspire and roll on top of that, if you want.
Player: Ten. So 18.
DM: 18. Not enough. All right.
