Van Lucy, a new heterogeneous demon which has appeared only recently. Its appearance is strikingly like a machine, which had lead many to believe that it was a weapon made by the gods. However, when some Demon Slayers brought back with them a piece of this demon, it was discovered that the possibility of that being true was very low. New research will be needed in order to determine what kind of creature it truly is.
A crystal from Van Lucy in the shape of an eyeball.