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The Nightwell is a font of incredible power created by the Highborne and sustained through the Eye of Aman'thul, one of the Pillars of Creation. The convergence of ley lines also feeds great power to the Nightwell. Similar to the Sunwell, it permeates and empowers the elves who dwell in its vicinity, but its consequences are much more severe. Being unable to feed off the Nightwell's energies causes heavy withdrawal symptoms and leads to degeneration into crazed, decrepit fiends: the withered. Arcwine is the method by which the Nightborne imbibe the Nightwell's energies, and the palace rations it to control the populace. Banishment from Suramar is the harshest punishment in nightborne society, as exiles are cut off from the Nightwell's power and faced with devolution; first into nightfallen, then, in time, into withered, a point of no return.
After the defeat of Gul'dan atop the Nighthold, the Eye of Aman'thul was secured by the Kirin Tor. Without it, the well has become unstable. Valtrois suggested to stablize it, even though the nightborne no longer needed it to sustain themselves, so that they could use its power, but Thalyssra believed it was best for the nightborne people to leave it behind them and let it die. The Nightwell's power and allure will fade, with time.
When the city faced starvation, this source of power would become more than a font for magical spells and works, it would become the principal source of nourishment in place of the exhausted food supplies. Crimes in the city were punished by exile, and thus those exiled would suffer the horrible fate. The effects manifest as immense pain and hungering need to feed off Arcane energy. Exile would deny any access to Arcwine resulting in starvation, deterioration, and, after a period of time, to the mindless Nightfallen second stage of Withered.
The Nightwell is the Nightborne elves' great source of power, and through it they have been able to meet the majority of their essential needs and maintain a refuge, shielded and hidden from the rest of the world they believed was overrun by demons. The energies of the Nightwell would alter their night elven forms further, becoming more slender and darker toned than previous, and causing the well would to be a necessary source of nourishment.
The fruit of the Arcan'dor frees the Nightborne of this addiction, even allowing Nightfallen to return to their previous states. After this discovery, Thalyssra begins to hand out the fruit to those she can, freeing her people of their terrible curse. Ultimately, with the Arcan'dor at their disposal, Thalyssra becomes the new leader of the Nightborne after Elisande's defeat in The Nighthold. She uses it to remove the addiction, and allows the Nightwell to burn out, as it had began to dwindle without the Eye of Aman'thul, which had been brought to Dalaran.
- Unlike how all high elves were addicted to the Sunwell, nightborne were dependent on the Nightwell as a source of nourishment.
- Before the creation of the Nightwell, the night elves of Suramar used a system of tunnels called the Arcway that contained arcane coils which tapped into the ley lines beneath the region. This fell out of use with the Nightwell's creation.
- The nightborne only learned of the horrible nightfallen withered fate that awaited exiles after the shield came down. It is possible that until that point the effect of the Nightwell and possibly its nature was unknown as exiles never returned.
- It is highly possible that the Nightwell, like the Well of Eternity, is formed from the very lifeblood of Azeroth's world-soul. noted as the player entered Suramar:
"Suramar, its "noble" citizens greedily slurping at their world's very lifeblood."  This is the same terminology used in Chronicle Volume 1 to describe the Well of Eternity ("the lifeblood of Azeroth's world-soul").
- Patch 7.0.3 (2016-07-19): Added.
- ^ 's gossip text : "The Nightwell is a font of incredible power. We must not allow the Legion to make use of it."
- ^ - Stellagosa's conversation with Valtrois
- ^ http://www.mmo-champion.com/content/5071-Legion-is-the-next-World-of-Warcraft-expansion!
- ^ Xal'atath, Blade of the Black Empire#Whispers
- ^ World of Warcraft: Chronicle Volume 1, pg. 36-37