If a Hero enters this Room and dies, the Room does not lose it's damage.
Once a Hero exits this Room and survives, it does 0 damage for the rest of the turn, even if you use something to increase it's damage (such as Annihilator).
This card is best built as the last room in a dungeon, mostly due to the fact of its effect. This card does well to have a Dizzygas Hallway built in front of it, so it has a better chance of killing a Hero so as not to activate this card's effect.
"Trash Compactors aren't so much built as grown. The deepest cesspits of Arcadian dungeons attract a deadly breed of beast that is only seen by the doomed."
-Excerpt from the Strategy Guide
This card is possibly a reference to a scene in Star Wars.