"The DM giveth and the DM taketh..."
The Dungeon Master, also referred to as the DM for short (but not GM!), is a special mechanic that allows the developers/channel hosts of the game to interact with the player base. He can add a bit of chaos to a run that is going smoothly, or he can even make a run that is going south become a winnable run. The DM can do a large variety of things like giving you 100s of thraxes, to even just snapping his fingers and making your character die from a massive amount of damage.
When the Dungeon Master isn't trolling you, he might be kind enough to help you out on your run. Just try not to get on his bad side... there's a reason the community has the mantra, "The DM giveth and the DM taketh."