The Longevity Tree.
An inexhaustible source of Vital Energy that vitalizes the land and makes it inhabitable for Elves, without which the tree buildings would not be able to grow.
The Tree was the eye of any elven settlement's protective formation, a cornerstone protecting the residents from the corruption of the undead and desire of the divine.
A sapling grown from a branch of the Enlightened Tree of Life, it connected all the Elves in the Forest Land together, allowing them to feel at home in its embrace.
It was so important for any Elven City that a city could neither be built without the Tree nor could it continue to exist after it lost its Longevity Tree.
Thus, the Elven Military had created an exclusive chain quest to search and revive the Longevity Tree of the Rajni City, its rewards tempting for even the Top Guilds.
[Revival of Rajni City (I)]
[Longevity Tree]