Rise of the Zandalari quest chain
The mysterious prophet only known as Zul has issued a call for Azeroth's embattled troll populations to unite into single empire. As the gathered troll tribes arrived at the meeting sight they were informed by Zul about Zul'Drak being lost to the Scourge and how Zul'Farrak is now a wasteland. They are told that the Zandalari plan to reclaim the former glory of the troll race, will crush any who stand in their way and states that the Troll Empires will rise again. While the other troll representatives present cheer and accept the Zandalari's offer, Vol'jin who views the Horde as his true brothers declines and seeks to stop the Zandalari. To this end he sends members of his tribe to both Orgrimmar and Stormwind recognizing that the threat of new Troll empire is something that the Horde can't handle alone. While Vol'jin is able to a gather mobile force to keep the Amani tribe from surging out of Zul'Aman, he is unable to contain the Gurubashi.
In Northern Stranglethorn Bambala, Fort Livingston, Nesingwary's Expedition, Grom'gol Base Camp and the Rebel Camp come under attack by serpents sent by High Priest Venoxis. High Priestess Kilnara sends panthers to attack the Rebel Camp and Grom'gol while the panther Mauti attacks the hunters at Nesingwary's Expedition. Both Grom'gol and the Rebel Camp later come attack by Gurubashi trolls led by Bloodlord Mandokir. After heroes of the Horde and Alliance beat back the Gurubashi attack they are sent to The Cape of Stranglethorn which faces it's own troubles.
Zanzil the Outcast aids the Gurubashi by turning the inhabitants of both Hardwrench Hideaway and the Explorers' League Digsite into voodoo zombies by poisoning the food in each town. After saving their respective towns adventurers will be sent to speak to a troll who is warning Baron Revilgaz and Booty Bay about the Gurubashi. This troll turns out too be none other than Vol'jin, the Darkspear leader himself.
Darkspear agents inside Zul'Gurub have discovered that Jin'do is wrestling Hakkar the Soulflayer into submission, holding him by spirit chains and stripping out his power into himself. They enlist adventurers to put an end to Jin'do's mad plans once and for all. Upon destroying the spiritual chains holding the Soulflayer in place, Hakkar turns upon Jin'do, and utterly destroys him, leaving only the corpse of Jin'do the Broken. Hakkar then returns the adventurers to the mortal realm, promising to deal with them another time, before vanishing. Meanwhile during this time Vol'jin lead a strike team into Zul'Aman and put an end to the Amani leadership.