Sharas’dal, Scepter of Tides, Part One
The ancient night elf empire was one of the greatest mortal civilizations that ever spanned the lands of Azeroth. At its apex, one figure held sway over it all. Her name was Azshara. She was a leader of leaders, a queen of queens. Her power was absolute, and her thirst for knowledge and glory was unquenchable.
Of the records that speak of Azshara, nearly all mention her bejeweled scepter called Sharas’dal. The legends claim it granted the queen command over the world’s seas, among other miraculous feats. So cherished was this scepter that Azshara rarely let it out of her sight.
It was with her when she raised the night elf empire to new heights. And it was with her when she later brought the civilization crashing down in blood and fire.
Sharas’dal, Scepter of Tides, Part Four
Queen Azshara’s enchanted scepter afforded her great power. Imbued with the Well of Eternity’s potent waters, it held sway over the rivers and the seas, aquatic creatures of all kinds, and the life energies that stirred within Azshara herself. She granted it a new name, one befitting its remarkable properties: Sharas’dal, Scepter of Tides.
One of the first things Azshara did with Sharas’dal was use its power to enhance her legendary beauty. As the years wore on, the queen seemed to grow younger and more mesmerizing. A brilliant aura enveloped Azshara, enthralling those who looked upon her. The Highborne marveled at this strange phenomenon. A few even took it as a sign of divinity.
Sharas’dal, Scepter of Tides, Part Nine
From a fragmented text called The Song of Scales, author unknown:
""They drifted into the abyss, but Azshara and her Highborne remained unbroken.
""The darkness around them was absolute, and so the queen willed Sharas’dal to bring them light. It did.
""Azshara’s and the Highborne’s blood ran cold, and so the queen willed Sharas’dal to warm them. It did.
""Their lungs burned for air, and so the queen willed Sharas’dal to let them breathe the water… but it did not. The scepter could not save them. Oblivion spread its arms and beckoned the desperate Highborne.
""As the ocean crushed the life from their bodies, ancient creatures stirred in the darkness. Their whispers flowed through the currents. Their powers wrapped tight around the queen and her servants.
""The Highborne became something new. Something more.
““A fleece of scales shimmered over their skin. Tails thrashed against the currents. The unknown entities made the queen and her followers one with the sea… they made them into the naga.””
The Restoration shaman artifact is a night elf artifact. And the night elves are shamans as naga. So there is an unexplored connection with them and the elements.
We see the night elves/highborne experimenting with elementals and summoning them in Surumar/ and in Nazjatar in the lab. So I would say they are lore plausible, and it’s more of a lost art from Azshara’s reign. It also explains Naga shamans and there past history when they were night elves.