Volcano

The Fiery Greatsword is a Hellstone weapon that has a very far reach, (as of 1.0.5 this sword now has the longest), and very slow swing speed. It emits light in the form of fire particles when swung, which can make it useful when scouting caves and scanning for ore through walls.

It can also be crafted with the Blade of Grass, the Muramasa, and the Light's Bane at a Demon Altar to craft a Night's Edge