Meanwhile—
Just as the Orc Magicians of the Shadow Council summoned the Dreadlord in an attempt to overthrow and seize power, Ner'zhul, too, was unwilling to be left out, making his final efforts and attempts.
The action to summon the Firelord had indeed failed, but that did not mean he was going to give up on the Firelord's powerful support.
After all, the source of a Shaman's power comes not only from Elemental beings, but also from the so-called 'All Spirits'.
Any supernatural existence capable of bestowing power upon believers deserves reverence.
Back in the day when Fel was all the rage, the Shamans pretty much switched en masse to being Magicians. When Kil'jaeden appeared before them and collectively gaslit the Shamans, Ner'zhul too, had offered incense and prostrations to Kil'jaeden, until later discovering that the high and mighty of the Burning Legion were not so benevolent, demanded too much, and gave too little, leading him to a change of heart.