The Lesion is an Infested polearm based off the Tipedo. Upon inflicting a Status Effect on its target, the Lesion gains bonuses to its Attack Speed and guaranteed Toxin procs, which coupled with its primary focus on Slash damage makes it a dangerous weapon against lightly-armored targets.
A Lesion is any abnormal damage or change in an organism's tissue, usually the result of injury or disease. It is derived from the Latin word laesio, which simply means "injury".
Though looking quite similar to the Tipedo (The Lesion's crafting component) in design and length, the Lesion uses Polearm stances while the Tipedo is a staff.
The Lesion has a non-static model; the "jaws" of the weapon close when not actively equipped, will open upon being wielded, and without a Stance equipped, the jaws will visibly "bite" on the thrusting second and fourth strikes of the combo.