Cobalt armor

Cobalt Armor is an armor set which requires 45 Cobalt Bars, or 135 pieces of cobalt ore, to craft, and is blue in color. Like all Hardmode ore armors, Cobalt armor has three different headgear/helmet options, allowing players to focus on magical, melee, or ranged combat, and each changing the set's bonus.

A full set of Cobalt Armor creates an after-image/motion blur effect similar to the Ninja clothes, Shadow armor and Necro armor.

Trivia

 * The hat, helmet, and mask appear very similar to a straw hat, a samurai helmet, and a ninja mask, all of which are common in media portrayals of Feudal Japan.