Delighted with your new map, you push the door. It's extremely heavy and you're quite tired by the time you finally enter the room.
You barely have enough time to notice anything in the room before an enormous troll leaps out in front of you. It's wielding a large axe.
Caught by surprise, you have no time to draw your sword before the axe hits you squarely in the chest. Blood spurts everywhere. The last thing you see is the troll standing over you as you fade into blackness.
You have failed to retrieve the diamond. Your journey ends here.