Cobalt armor

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