Stagbreaker is your go-to weapon in the sunken crypts.

Knock the debris pile down to the point where you are close to opening up the passage way into the room, and if you are hearing the flies associated with the spawn piles, break out the Stagbreaker and start slamming the ground. Hopefully you are close enough to the spawn pile to destroy it. This also works on outdoor spawn piles, if they are in one of the stone towers. You can stand outside the back of the tower and destroy the spawn pile without having to charge into the spawned draugers.

This is also the go-to weapon for early game burial chambers. If you are an under-armored newbie and open a wooden door and see a room full of skeletons, quickly close the door and break out the stagbreaker. You can then kill all the mobs from behind the safety of the closed door.