The Web of the Tsuchigumo

Origin
These webs are said to have been created by the Tsuchigumo, a spider-like Yokai from Japanese mythology. It was used by the Tsuchigumo to conjure various Yokai. Minamoto-no-Yorimitsu defeated the Yokai, and then destroyed the Tsuchigumo. This adventure is chronicled in the Tsuchigumo-soshi.

Effects
The webs are able to turn any object, animal, or plant into a monster. The monsters can be dangerous, but are vulnerable to Neutralizer goo.

Collection
After Minamoto-no-Yorimitsu defeated the Tsuchigumo, he kept the webs in side of a tool shed. Several years later, it was discovered by Leena inside of the very same tool shed and taken to Warehouse 13.