Corpus

"The Corpus are a dominating proto-corporation of humans that maintain and operate the trade routes of the Solar Rails. They are rarely seen by others and are better known for the robot proxies that serve for them. The social structure of the Corpus is said to reflect ancient mercantile guilds from the Old Earth. Their production methods blend technology and ritual, in-part, because the ancient Orokin materials they use are inscrutable to them. They control the entire supply chain of goods that flow through the solar system. The Corpus view Orokin artifacts as resource to be exploited for profit− at any cost."

- Warframe Official Website

The Corpus are one of the enemies encountered after the Grineer, and operate differently. They tend to use robotic walkers called 'Moas' and Crewmembers as their basic infantry, but also employ stationary turrets and cameras. They also make use of various drones, which can perform various actions such as laying mines or shielding nearby Corpus. They can be stunned by electric damage.

Crewmen
The basic infantry of the Corpus, Crewmen are light armored units who use basic weaponry. They can be stunned by electric damage, making them easy prey on their own. The crewmen head is the weak point, but is also very well armored. Armor Piercing Damage or Puncture Mods are needed to hit the head.

MOA
These are robotic bipedal walkers used by the Corpus as a form of support. Essentially, they are walking turrets that will run towards players, firing at them once within range. Their health is low, yet they possess moderate shields. MOAs will not become stunned if hit by a melee attack and rarely take use of cover. MOAs can be spawned by "constructors", which are indestructible and look like large containers. In some cases, constructors can spawn MOAs indefinitely.

Osprey
Ospreys are flying robotic units used by the Corpus. Relatively fragile, they provide support with buffs and debuffs instead of blunt firepower. The Ospreys' ability to hover makes them difficult to strike with melee attacks.

Utility
The Corpus faction employs security measures around their bases that can lock unsuspecting players in a room full of turrets or even block them from leaving rooms with laser barriers that can completely drain shields.

Ambulas
Ambulas is the last boss of the Pluto system. He can be found on Hades. He has the possibility of dropping one of the following on death: Excalibur Chassis Blueprint, Excalibur Helmet Blueprint, and Excalibur Systems Blueprint, as well as Morphics.

Sgt. Nef Anyo
Sgt. Nef Anyo is the final boss of Mars system. He can be found on War. He has a possibility of dropping one of the following on death: Mag Helmet, Mag Chassis and Mag Systems blueprints, and Gallium.

The Hyena
The Hyena is the final boss of the Neptune system, and can be found on Psamathe. The Hyena has a possibility of dropping one of the following on death: Loki Helmet, Loki Chassis and Loki Systems blueprints, as well as the Control Module.

The Jackal
The Jackal is the final boss of the Venus system. It can be found on Fossa. It has a possibility of dropping one of the following on death: Rhino Helmet, Rhino Chassis, or Rhino Systems blueprints.