1 Mike: The tapestries are made of magically treated green slime and brown mould.
2 Mike: If they take any physical damage at all, they instantly cover you in green slime, causing instant death with no saving throw.
3 Mike: Green slime is vulnerable to fire, but if you try to burn them away, they turn into brown mould and suck all the warmth from your body.
4 Eleven: I get it. This room is deadly.
4 Dustin: Did we mention the venomous snakes?

A little knowledge is a dangerous thing. Especially in a Gary Gygax dungeon.