Wyvern Lance

Wyvern Lance is a polearm. When used in mid-air, this lance's damage increases by 50%.

Source
Wyvern Lance can be purchased from arms vendors in Altissia, Cartanica, Tenebrae, and Gralea for 5,000 gil. It can also be found as a collectable in the Crestholm Channels and Pitioss Ruins dungeons. It can be sold back to shops for 2,500 gil.