EREBUS

Set to 4 different clues across 5 published puzzles, most often “Darkness personified” — The New York Times, Saturday, 12 December 2009.

6 letters

Every clue on record, most used first

Darkness personified2 times
The New York Times — Saturday, 12 December 2009
Cavern on the way to Hadesonce
The New York Times — Sunday, 7 August 2005
Antarctic observatory mountonce
The New York Times — Thursday, 7 November 2002
Place of darkness on the way to Hadesonce
The New York Times — Thursday, 12 March 1998