Aessina is one of the greater wilderness spirits who lurks in dense untamed woods. She is the soul of the forest, its beating heart, the source of life energy that breaks down stone, devours ancient ruins, and fills dense thickets with mystery and fear. Aessina is the center of the web of life. The night elves have built shrines to her throughout Kalimdor, most notably the Shrine of Aessina in the midst of a forest glade in Ashenvale's heart and the Grove of Aessina located in Mount Hyjal.
Aessina is Ysera's everlasting companion, both in the Emerald Dream and the physical world. The Ancient of Lore named Nordu was Aessina's "dearest old friend", and was likely so for most of the eons of his existence until his death at the hands of fire elementals from the Firelands.
This section concerns content exclusive to Cataclysm.
At a point in Mount Hyjal questing, players will soon be sought by the wilderness spirit Aessina to assist in cleansing and healing the nearby forest, ultimately returning the land to its former splendor. Aessina herself appears there during the quest  in the form of a large wisp in a glowing light above the grove's moonwell.
Completion of the quest is one of the requirements to being eventually able to access the Molten Front.
- The "Dryad Shrine" shown on the map of northern Kalimdor in the Warcraft III manual may be in relation to Aessina.
- Her shrine was built ages ago by the night elves, and lies in the midst of a forest glade in Ashenvale's heart. The shrine is a clear forest pool with a statue of Aessina standing beside it, clothed only in ivy. Dryads are known to visit the shrine to venerate Aessina.
- She's voiced by Jessica Straus.