The Vortex Cannon is a rugged rocket launcher made entirely out of stainless steel. It has an iron sight heavily stylized to resemble a gust of wind, a fin located at the back and a front grip near the mouth.
In EBF4, the Vortex Cannon is the most powerful weapon for Lance magic-wise. It gives him the greatest boost possible in Magic Attack at a small cost of Accuracy and Evade, but no improvement in Attack. It also improves his Wind skills, and may cast Shockwave with certain skills.
Epic Battle Fantasy 4
The Vortex Cannon is found in a chest in Lankyroot Jungle.