Cobalt Sword

The Cobalt Sword can be crafted at an iron anvil with 10 Cobalt Bars. It is usually one of the first weapons players may craft after defeating Wall of Flesh and then destroying the first Demon Altar, due to the fact that Cobalt Ore is the first of the three ores that appears and is also a necessary material for mining the remaining two ores (Mythril Ore & Adamantite Ore). 350px

Trivia
The weapon bears a resemblance to a weapon called a dai katana. The katana has the handle and guard, but the blade is enlarged to twice the normal thickness. This type of katana is not often seen, being mostly harder to wield. The weapon also bears a resemblance to Muramasa.