Red Potion

This item number used to belong to a scythe that nobody could ever hold. It sat in the files with no drop, no recipe and no shop entry, and a later patch cut it out completely rather than finishing it. The free number went to this potion, which is why old data dumps show the two connected.

The scythe was a nod to Soul Eater, built after a named attack from the series. That resemblance is the likeliest reason it was quietly pulled instead of being given a source.