Which two traits form the dark triad along with narcissism?

The dark triad is a cluster of three negative personality traits that includes narcissism, Machiavellianism, and psychopathy.123

Coined in 2002 by psychologists Delroy Paulhus and Kevin Williams, the concept describes these three traits as overlapping yet distinct, sharing common features such as emotional coldness, duplicity, and aggressiveness. While narcissism and psychopathy can manifest at extreme, pathological levels, within the dark triad they are generally examined at subclinical levels. Some researchers have more recently proposed expanding this framework to include sadism, which would form a "dark tetrad".1