Cobalt Bar

Cobalt Bars are bars crafted from 3 Cobalt Ore. Cobalt is the first tier of the three Hardmode ores that the player is able to obtain. Cobalt is the equivalent of Pallidium. When the first Demon Altar Is broken, Cobalt or Pallidium is chosen randomly and the other one will not spawn naturally in that world.

Crafting all Cobalt equipment requires 145 bars, or 435 ore.

Trivia

 * Several Cobalt items have a distinctive Eastern theme, the spear being a naginata, the sword somewhat resembling a Katana, or the katana-like Muramasa, the Chinese themed Repeater, and the headgear variations resembling Japanese and/or Chinese headdresses.
 * Real cobalt isn't blue in pure form, but cobalt oxide is used to make a blue pigment, which probably inspired its appearance in the Terraria.

History
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