Gates of Ravenloft
From Hayashi Park Potterverse for 5th ed. Dungeons and Dragons (5e)
(page 38) There's a thousand foot drop so.. you know, you're dead. Green slime is on DMG page 205: DC 10 DEX save, 5(d10) acid damage. It does 11 acid to wood or metal. It does this damage until scraped off. You might want to have the slime damage the boots of some of the PCs to set up my idea for Helga (page 64). The gates lead to the Front Courtyard (page 52). [1]