Dark Gift of Norganas, Finger of Oblivion

Norganas’ gift is the power to turn life into undeath. This dark gift allows the beneficiary to cast Finger of Death at will. However, any time the beneficiary casts this spell more than once per long rest, they must immediately succeed on a DC 15 Constitution saving throw or die instantly. 

This Dark Gift turns the beneficiary’s blood pitch black and viscous, like tar.