Eshkar Niin was a male Iktotchi and a member of the Imperial Knights, a Force-using Order loyal to Emperor Roan Fel of the Galactic Empire.
Niin became a Master within the Order and the instructor of Antares Draco, to whom he taught strategy and philosophy while training the Human in the ways of the Force. Niin later abandoned his vows as an Imperial Knight and deserted the Order. He attacked the Empress Elliah Fel and killed her, but was subsequently defeated by Draco, who had been sent to kill him by the Emperor. Draco believed Niin to be dead, but the Iktotchi survived and joined Darth Krayt's Sith Order, becoming the Sith Inquisitor Darth Havok. Krayt's Empire seized control of the galaxy from Fel in 130 ABY, and seven years later, a group of Sith took Fel's daughter Marasiah captive and brought her to the galactic capital of Coruscant. From there, Havok took her to the Sith planet Korriban and began torturing her, hoping to learn valuable secrets of her father's.
After the final death of Darth Krayt and the overthrow of the One Sith, Darth Havok met Darth Nihl on an unnamed world. Havok advised Nihl that those who could had left Korriban while those who remained behind had died. Nihl told Havok to order the Sith fleet into hiding, and for the surviving members of the One Sith to infiltrate every government they could in order to bide their time for the right moment to strike.