Night's Edge

The Night's Edge is a high-end melee weapon, crafted at a Demon Altar. It requires one each of the four currently most powerful sword-class weapons to craft: a Light's Bane, a Muramasa, a Blade of Grass, and a Fiery Greatsword. It has the same lighting effect as the Fiery Greatsword as when swung it creates light, but it seems the effect is more subtle and does not last as long.

It has a very slow attack speed, deals 40 damage, and has about the same reach as a Muramasa. It can be a devastating weapon, as it deals about 72 damage per second. However, due to its low attack speed, enemies don't fall quite as quickly as they would if using the Muramasa. Using Feral Claws with Night's Edge can prove to be a faster damage dealer. Using Molten Armor in place of Shadow Armor will sacrifice 0.07 DPS for molten armor's greater defense rating, though Shadow Armor is available mid-game as opposed to Molten Armor.

Putting any of the above four weapons in the Guide's "Crafting" option will reveal the full recipe and Demon Altar requirement.