Call Wyvern is a job ability available to Dragoons in Final Fantasy XI. It is available immediately, at level 1, and has a recast time of 20 minutes. Call Wyvern will do as it describes and summon a wyvern to come fight along side the Dragoon.
Call Wyvern was once the Dragoon's special job ability, but it was replaced by Spirit Surge. This was due to the view that Dragoons relied too much on their wyverns, which had historically been very easy to kill, to leave the ability with such a long cooldown. Because of this, Dragoons were few in number and had continued to be one of the less popular direct damage jobs, a trend that did not begin to reverse until 2008.