Armadura

Armadura (from Spanish, meaning "Armor" - a.k.a. "Suits of Armor") are Las Plagas-possessed suits of armor, inhabiting the darkest corridors of the Salazar Castle.

Characteristics
These creatures attack with medieval weapons, such as claymores and halberds. The weak point of these armors are the helmets. If damaged enough, the Plaga will break free of the helmet and expose itself from the neck of the armour, becoming vulnerable to gunfire, and particularly flash-bang grenades, which will kill an exposed Plaga instantly.

There are two varieties of the Armadura: one in a lighter-colored silver armor and a round helmet, which tends to contain a 'tentacle' type 1 Plaga and wield a broadsword, while the darker black-and-gold armor with a square helmet will usually contain a 'centipede'-type 2 Plaga that is incredibly dangerous due to its instant-death head bite. It carries a heavy axe.

Additionally, some Armaduras may attempt to ambush their victims by staying still among other armors, waiting until their target approaches before making a single attack when in range. This attack can be dodged and doing so will invariably cause the armor to collapse, presumably due to the concussive stress of hitting a solid floor, but the armor will still collapse if the player is hit. Once these one-attack Armaduras disintegrate, there is no evidence of the Plagas ever inhabiting the armor, perhaps due to the crushing weight of the armor or self-destruction.

Role in Resident Evil 4
They are first encountered as Ashley Graham ventures by herself in the back passages of Salazar's castle, shortly after having been released from the iron bindings trap. At first, the Armaduras appear to be harmless armors lining on the walls of various passageways. Later on, when Ashley retrieves the emblem to open the door to the upper levels, the Armaduras spring to life and attack her. Ashley must run from these enemies avoiding the stationary sets of armor as she runs from her mobile pursuers. And, to make a seemingly laughable encounter one of the scariest parts of the game, it's pitch black.

Leon is later attacked by 6 Armaduras guarding The King's Grail needed to open the way to the Novistador Nest Tower. The Armaduras consist of three of each type (square helm, round helm), with each type attacking in a wave. The last Armadura to fall in each round leaves a 6.500 Peseta reward after dying.

Strategy
A good way to kill an Armaduras is to aim a shotgun blast at their head. That will usually either stun them so that they need to recover their strength, or instantly reveal the plaga. Instead of taking all of them out one by one, you can expose all of their plagas and then throw a flash grenade, easily killing a boss in six to twelve shots. Be careful doing this, though - when you fight the black ones, they will spawn centipede plagas.

Another good way is to focus at one at a time; blow off their helmets with a shotgun and spray them with the TMP, quickly taking them out. This would be useful for the black Armaduras.

Trivia

 * On easy difficulty. Armaduras are not encountered, besides playing as Ashley. Instead, the King's Grail is automatically found and does not have to be collected.
 * The Armaduras are the only "enemy" in Resident Evil 3.5 that has made it to the final product.
 * Before finding the King's Grail, a player must dodge their "attacks", if they fail, this attack will take half of Leon's health.
 * Their Weak spot is their "head". Even tho is armoured, few shots in the head (even from a handgun) will make them kneel.
 * During the short time the player controls Ashley, if they fail to dodge the attacks from The Armours, they'll loose all their health except for a tiny bit (PRO mode).