The Lord of the Entombed

The Lord of the Entombed is the leader of the Entombers of Unatta. After millennia of research the Embalmers succeeded in devising a mummification capable of nullifying ageing as well as a sarcophaguses that prevented death for whomever is inside of it, thus enabling them to entomb their leader as a means to bestow her with immortality.

In Tales of Avon
The Lord of the Entombed is a nemesis character who may be fought by disabling all her flailing limbs, then opening the sarcophagus and delivering the ending blow. Alternatively, she may be pacified by offering her the fate thread of Destiny's Child.