Destiny: The Taken King – how to find and open the Dreadnaught's poisonous chest

There's a chest located on the Dreadnaught in Destiny: The Taken King which is located in a room with a poisonous floor. Should you try your hand at it? Of course you should, because if you are quick enough, you can loot this particular chest without dying. When entering the Court of Oryx, off to