Possessed Armor

Possessed Armor is a Hardmode enemy that spawns at the surface and underground at night. It walks quickly, and during a Blood Moon can open doors. It casts a motion blur similar to that of the Shadow Armor.

Possessed Armor is immune to the On Fire! debuff.

Trivia

 * Although the motion blur and purple color of the armor could infer that it's Shadow Armor, it's sprite heavily resembles the old Cobalt armor, minus the head spines.
 * Possessed Armor appears to have animations similar to that of players.