"Corruption seeps from the wood around the bow, oozing from every bow. Knocking an arrow causes the corruption to jut towards the fresh wood, trying to corrupt every last splinter of it."
Item Corruption Infused Longbow can be crafted on Workshop tier II. You need 700 of Depths Materia. In results you get 1 of Corruption Infused Longbow with 495 gearscore. For crafting required Engineering skill with level 1 or higher.