Once the final Deep Claw is defeated, loot the chest for your rewards. Make sure any Minstrels doing their class quest do not activate the altar on top of the ramp in this chamber until everyone is ready. Doing so will activate the Minstrel boss fight.

Crack Tooth Minstrel Boss is activated by using the altar as mentioned earlier.Keep the fellowship on top of the ramp when you start this. This fight will start with waves of up to ten elite 10k morale Grodbog workers swarming out of the ground at once. Keep the tank and melee on the ramp-way. This will provide a choke-point for the tanks to grab these AoE mobs preventing them from reaching the rest of the fellow. If one should break through the choke-point on the ramp, someone must bring it back to the ramp away from the Minstrel and the ranged fellow. To stop these waves you must do one of two things, you must either AoE them all down or focus fire on one target at a time. This is a very important especially later in the instance. Once you have defeated a handful of waves of these workers, Cracktooth will pop out of the ground. This can be fought on the floor level. Do not fight on the floor level until then. Once he is dead you can move on to the final fight which is the Grodbog Queen.