1 Dustin: Anyway, we don’t need to detect the secret door. We know it’s there.
2 Mike: But the only way to open it is with Dispel Magic or Remove Curse spells.
3 {beat, the boys all look at Eleven}
4 Eleven: I sure hope when it comes to actually fighting anything you guys are going to be swinging swords and not looking at me.

For a super deadly adventure, there's actually not a lot of combat encounters in the Tomb of Horrors.