|Title||<Ancient of the Arcane>|
|Race||Ancient of the Arcane (Elemental)|
|Location||Tower of Estulan, Feralas|
Arcosin is a very rare Ancient of the Arcane, one of the few known in the Warcraft universe, and the only one that is friendly to players, albeit only to the Alliance. Arcosin is stationed at the Tower of Estulan, an outpost maintained by the Shen'dralar.
- His name is probably meant as a reference to the inverse trigonometric function arccosine (commonly read as cos^-1).
- Patch 4.0.3a (2010-11-23): Added.