Heart of Nightfang Spire, adventure for D&D 3rd/3.5th ed, by Bruce R. Cordell.
“Nightfang Spire has long brooded in lonely silence, shadowed within the walls of a steep defile. A tall stone column, it resembles nothing so much as an enormous fang of some vanished, mythical beast. Once, a fervent religious order thrived here – before its god was slain. Embracing that death, Nightfang Spire was transformed into a massive, hollow mortuary filled with the restless dead.”
Stand-alone adventure for 10th level characters.