Since most of the party had never set foot in Thunder Bluff before, and they assumed the Archdruid could afford to wait a little bit longer before they all met, Turuk Thunderhoof and Tonga Runetotem took the time to show the party around the city, to see its sights and learn some of it, before they would all continue on from there to the Elder Rise.
Toward the end of that journey, as they rose to the highest plateau of the city's central mesa, Zachariah Hallowhold saw the outdoor auditorium space that stood centerpiece to the space. He seized the opportunity as he could, with no others using the space and seemingly no-one around to stop him, and took center-stage at the auditorium to preach out to anyone who would listen about the balance of light and dark. At first, his proselytizing was to an empty audience, though bit by bit a small group of individuals did stop by to bear witness and hear the priest's words.
Once the party eventually came to realise that Zachariah was not among them, they soon retraced their steps to find the forsaken; and thereafter tried to get him along for them all to head to the archdruid.
They found Hamuul Runetotem within the central tent at the Elder Rise, gathered there together with his fellows of the Cenarion Circle. It did not take long before the old druid grew to understand the direness of the situation at hand -- and once he did, he saw to it that anyone who did not need to be present were sequestered away, before a private congregation was formed between himself, the party, and the most prominent others there.
Tonga Runetotem elaborated to the Archdruid what they had learned during his trip to the Barrens, and with the materials he and the party had brought along with them, Hamuul led the congregation all together to delve into the Dream. Steeped deep in slumber, visions took the party together as the bird would fly from Thunder Bluff and out into the Barren savannahs, and from there to a hilly landscape where old, verdant oases lay down along the foothills. There was nothing there on the surface that the party had not seen before, when they were out in the Barrens themselves, but the visions quickly continued on down through cracks in the rock and into dark, damp underground caves that looked to flourish with life.
Deeper and deeper down, to nests of snakes, raaptors .. and elves. Though certainly out of place, the elves seemed ordinary at first, speaking to one another in words none of the dream-walking druids and party members could understand. When they got a chance to examine them more closely, they all could tell the unusually serpentine appearance of them; from their sharpened fangs to the coarse, scale-like protrusions over their skin.
As the vision eventually saw them all retreat, the Archdruid not to keen to delve long enough for the elves to notice their presence, they all felt themselves beckoned off aside; into a small pocket further back out from the elves, where two tauren and another elf looked to be hiding away. It was then that one of the druids taking part in the ritual -- Nara Wildmane -- burst an exclamation out aloud as she recognised the group.
The ritual came to a sudden end, commotion arose between the druids as to just what had happened. Hamuul Runetotem turned everyone's attention to Nara, who then laid the tale clear about how she and a few others -- the two tauren from the visions included -- had secretly worked to help a group of elves into the Barrens in hopes that they could help revitalize the dying oases that the Thunder Bluff druids by themselves had yet to resolve.
The reason for their secrecy? They had all feared that making it too known, involving the whole of the Horde and the political mire of Orgrimmar, would take far, far too long. At worst, they feared that seeking help from night elves would mean the plan would die in its entirety before even given a chance. They did not want to take that risk, and so instead opted to do this entirely in secrecy.
Commotion broke out between the druids nearly in an instant, differing minds clashing for whether what had been done was right or wrong -- before Archdruid Hamuul bellowed out for the congregation to silence. Sternly, he requested the utmost secrecy from all for what they had just learned, at least until they could all properly understand the situation at hand. None of them truly knew what the elves were doing, if their intents were ill from the beginning or if something else had happened.
In truth, as they all had walked the Dream, the druids could all feel the harrowing touch of the Nightmare creeping upon them when they ventured down in the caves.