Arunika was a succubus devil and, in the mid–15th century DR, one of the major players in the struggle to claim Neverwinter from the ashes of the cataclysm that tore the city apart and plunged several factions into contention.
Working indirectly, Arunika planned to weaken the warring factions of Thay and the shadovar by playing them off one another until such a time as they were easy picking for the Abolethic Sovereignty.
Initially, in the Year of the Reborn Hero, 1463 DR, Arunika sided with Herzgo Alegni, the shadovar representative in Neverwinter, thinking he was the most likely to come out on top. Things quickly changed however, when Sylora Salm was defeated by Drizzt Do'Urden and Dahlia Sin'felle, which effectively removed Thay from the equation.
Arunika changed her plans after this. She sensed that Alegni was up against forces that even he could not hope to overcome; accordingly, she shifted her intentions. In the ensuing showdown in 1463 DR, Arunika failed to come to the aid of her ally, instead searching for further information on the dark elf through contacts in the Abyss. As a result, Alegni was defeated at the hands of Drizzt, Dahlia, and Artemis Entreri. She continued to make moves from behind the scenes to pave the way for the Sovereignty. However, for her illicit relationship with Alegni, Arunika was killed by Brother Anthus.