Sahelanthropus

Sahelanthropus is the forth, tenth, and final boss faced in Metal Gear Solid V: The Phantom Pain.

Description
Both Sahelanthropus encounters are extremely similar, Sahelanthropus being a towering 50-foot tall robot that has a variety of attacks, all devastating. These attacks include gatling gun fire, missile storms, flamethrower blasts, and rail-gun blasts. Sahelanthropus is also equipped with a colossal fiery whip that hardens into a long-sword, which it uses to stab into the ground and spawn a stream of stalagmites that explode.

In the first boss, faced in Episode 12: Hellbound, Sahelanthropus is invincible, and the boss is treated as a stealth section. Sahelanthropus is automatically alerted to the player's presence but the player must lose said alert to complete the mission. The best method is to simply sprint away and get behind cover as much as possible until Miller tells you over the radio that "you're not out of the woods yet". This means Sahelanthropus has lost you but has deployed small flying robots to scan the area in search of you. If the robots don't find you in under around 30 seconds, they'll explode and Miller will announce Sahelanthropus has completely lost you. It will then begin to patrol the area, destroying random objects and roaring, allowing the player to sprint to one of the two LZs and board the chopper.

The first and final phase, faced in Episode 31: Sahelanthropus, is a traditional boss, Sahelanthropus even possessing a health bar. Sahelanthropus is mostly invincible to all attacks due to its heavy armor, but the mechanical beast is adorned with several large gas-tanks that act as weak spots (on its stomach, around its shoulders, and on its back) and will deal major damage if hit with a missile launcher. The best tactic is to seek out a tank and use it to assault Sahalenthropus's weak spots. Helicopters and supply drops will also be automatically called in to assist the player.