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

 * Judging by the style, color, and motion effect, this enemy appears to be a possessed set of Shadow Armor, though without its helmet flairs and color highlights.
 * Possessed Armor appears to have animations similar to that of players.