Enigmatic talking skull
The Flameskull is a disembodied skull, covered in runes, which sits atop a black marble plinth in the center of a circular room in York Catacombs. When a living being enters the room, the Flameskull bursts into flames and rises from its plinth.
When ‘awakened’, the Flameskull demands that those who wish to pass through its chamber answer a riddle as the price for doing so. If its question is answered correctly, the Flameskull sinks back onto its plinth and the flames which wreathe it die down. The purpose of the Flameskull is unclear, but it is clearly intelligent, enjoying conversation with those it encounters and displaying a wry sense of humour.