The Emboweled Coffin of the Tutelar Fiend

From the introduction:

After the last of 99 blasphemous wizards were educated in the Tower of Fiends, its basalt walls were torn down and set stone by stone into a maddening maze around the belly of the dark academy. Deep in the cavernous foundation are the remains of the Tutelar Fiend, whose dripping bones must be destroyed to unpin the power of the rampaging wizards!