Mysterious Stone Doors

In a shocking display of skill (and possibly luck), you land a
perfect fireball
at the door that deals exactly enough damage to break it open!
At this point the story doesn't matter anymore, you've proven you've got the sick skills to carry this adventure alone.
Screw whatever that noise we heard was, whatever ancient, deep primal instinct that made you care about it is irrelevant at this point!
The stone crypt awaits ye, almighty sorcerer.