Bag of Void

This seemingly ordinary bag holds a portal to the Void Dimension, an infinite, lightless dimension. The Void is filled with a strange, black-violet, plasma-like gas that behaves unlike any known substance. Upon contact with matter, the gas condenses into a substance somewhere between liquid and solid that is highly corrosive to organic material.

Void Exposure. Organic matter placed within the bag begins to deteriorate immediately. Food and other consumable materials are rendered completely inedible almost instantly. Any organic creature or object that enters the bag takes 1d4 necrotic damage at the end of each minute it remains inside, while the essence of the Void covers every reachable space on the body, potentially filling a creature's lungs, causing it to suffocate. 

Void-Touched. If a blade, arrowhead, or other weapon component capable of piercing, slashing or bludgeoning is left inside the bag for at least 1 minute, it becomes temporarily infused with the essence of the Void. For 1 minute after being removed, attacks made with the affected weapon or ammunition deal an additional 1d4 necrotic damage.