Taniks, the Scarred
Taniks, the Scarred is an infamous Fallen mercenary working for the House of Wolves during the Wolf Rebellion, though he will hire himself out to any House. He is encountered in The Shadow Thief Strike.
Taniks is known to graft technology onto himself from each of his exploit, including salvaged tech from the Fallen, Vex, and Humanity. He also craves combat, as he views his enemies as trophies and as such hones his combat skills for fun, and worships machinery to such a degree he has augmented himself extensively.
During the early City Age, Taniks sought to claim the bounty on an infamous crew of Hunters, including Andal Brask, Shiro-4, and Cayde-6. During a mission where Andal led to raid one supply cache while Cayde, Shiro, Nian Ruo, and Lush hit another, the Fallen mercenary ambushed Nian and Lush; murdering the former and destroying the latter's Ghost before they escaped. Despite their losses, Andal and the others decided to hunt down Taniks in retaliation, with Andal having failed to kill Taniks became the new Hunter Vanguard while Cayde-6 (having presumably killed the Fallen mercenary) would continue living the life of a free Hunter.
However, Taniks survived his encounter with Cayde after his crew rebuilt him back from the dead. He then proceeded to murder Andal in cold blood, to which Cayde took up the mantle of Hunter Vanguard in memory of his fallen friend.  Cayde, acting on revenge, attempted to kill the mercenary a second time only for Taniks' crew to steal the latter's body before he could finish the job.
Wolf Rebellion and Death
Hired by the House of Wolves, Taniks and his crew attempted to plunder the Hellmouth before a fireteam of Guardians, sent by Variks, arrived to kill him, pursuing the mercenary through his Ketch before meeting his end. 
Taniks's infamy among the Guardians would carry on, as his form would taken as a Nightmare that the Guardians would face in the newly discovered crimson fortress on the moon. The Nightmare of Taniks, the Scarred, representing the Essence of Isolation, would be hunted down by Guardians sent by Eris, as she needed the essence to forge armor needed to resist the Nightmares and breach the Pyramid.
He and his Ketch, Kaliks-Syn, are found on the Moon. Unlike most Fallen commanders, he is armed with a Scorch Cannon, which he uses with devastating effect. With this weapon, he can effectively hold down an area at any range. In addition, he will smash the ground if a Guardians wanders too close to him. Like many Captains, he can teleport. Unlike most Captains, though, he can teleport long distances. He uses this to avoid being defeated in one confrontation, requiring players to wear down his health until he can be cornered.
List of appearances