|Affiliation(s)||Old Gods' forces, Black Empire, Azj'Aqir|
Desperate to recover the Discs of Norgannon from , the traitorous keeper unearthed the tombs of Kith'ix and his fellow C'Thraxxi general Zakajz and sent them to slay Tyr and reclaim the discs. Sensing Yogg-Saron's influence on Loken's mind, the two readily obeyed the keeper. Kith'ix and Zakazj overtook Tyr and his allies in the lands that would become the Tirisfal Glades. Fearing for his allies' lives, Tyr chose to hold off the C'Thraxxi alone so his companions could escape. The C'Thraxxi grappled with Tyr for six days and nights, torrents of arcane and shadow energy ripping through the glade. In the end, Tyr sacrificed all of his remaining power and life force in a blinding explosion of arcane energy that killed Zakajz and nearly killed Kith'ix. Despite being gravely wounded, Kith'ix survived and blindly fled southwest before collapsing at the base of the Zandalar Mountains. Reeling from its presence, the ancient loa inhabiting the area buried Kith'ix beneath the earth so that no other creature would disturb it.
Kith'ix's resting place, which appeared as a small mound of blackened stone, was forbidden by the Zandalar tribe's witch doctors and priests. The loa warned the tribes' mystics of severe consequences should they disturb the black stones. Though it remained undisturbed for thousands of years, eventually the sentient dagger Xal'atath led the troll and his followers to the forbidden mound, where they discovered that it was not rock but the hide of some monstrous creature. Believing it to be an undiscovered loa so powerful that the other spirits were afraid of it, they performed profane rituals—offering blood sacrifices and plunging Xal'atath into its hide—to awaken the C'Thraxxi general from his slumber. Kith'ix brutally slaughtered the trolls in recompense.
Knowing it would please the Old Gods to see the trolls' civilization annihilated, Kith'ix reached out with his mind and found the aqir, having hidden deep underground since the fall of the Black Empire. The C'Thrax rallied the insectoid swarms to reclaim the surface of Azeroth once more. As both Kith'ix and the aqir expanded their power, they constructed a vast subterranean empire known as Azj'Aqir. When Kith'ix judged their strength sufficient, he led them out of their tunnels to sweep across the land.
Though the trolls were formidable foes, the aqir were unlike anything they had ever faced. Many smaller tribes were completely consumed by the swarms. Kith'ix himself proved an extremely powerful foe as well, unleashing the dark powers of Xal'atath upon the trolls. However, the Zandalari rallied the tribes against this new foe and summoned the loa to fight by their side, tearing through the aqiri ranks and even wounding Kith'ix.
The aqir were forced to retreat and Kith'ix, gravely wounded by the loa, fled to the northeast with a contingent of its closest aqiri followers. There, it planned to regain its strength while the insectoids continued their war against the trolls. Unwilling to leave them unchecked, the trolls sent their most ambitious tribes to hunt down their retreating foes and establish new strongholds across Azeroth.
The Amani tracked the C'Thrax's trail far to the northeastern woodlands, cutting through an unending mass of aqiri guardians. In a final savage battle, the entire tribe flung itself in a suicidal attack against Kith'ix and its remaining insectoid minions. Only a tiny fraction of the troll army survived. Even so, the C'Thrax succumbed to its tireless hunters.
Atop the site where they had killed Kith'ix, the trolls established a new settlement. It would one day grow into a sprawling temple city known as Zul'Aman. With the C'Thrax gone, the aqir no longer fought with as much ferocity or purpose and the war between the aqir and the trolls shifted dramatically.
- As he is buried under Zul'Aman and was once thought to be a loa, Kith'ix may be the source of the darker essence that bound within himself.