Death Egg Robot (Sonic Forces)

The Death Egg Robot is a massive mech piloted by Eggman and is the final boss of Eggman Empire Fortress, and the final boss of Sonic Forces.

First phase
The player will begin the first phase of this boss as Classic Sonic. The player is on a platform full of purple blocks, and one by one, the blocks on the left will disappear, replacing themselves on the right. After a certain amount of time has passed, the blocks on the right will begin to disappear, replacing themselves on the left. With this knowledge, the player must be on their toes and move quickly to gain safety on the ground.

During the first phase of the boss, the Death Egg Robot has two attacks and has six hit-points. The first attack has the Death Egg Robot firing a laser that sweeps across the platform, clearing away the topmost layer of the platform. This is easily avoidable with a simple jump. In later stages, the Death Egg Robot can use this attack two or three times in succession.

The Death Egg Robot's second attack is similar to the Egg Dragoon boss's attack, in which solid rocks are hurled at the player. The player can easily counter this attack by hitting the solid rocks, but keep in mind that the rocks do not stay sitting on the platform: they actually clear away parts of it. The player needs to jump at the rocks as they are in the air. The rebound rocks will then hit the Death Egg Robot, and they will bounce back to the player's field, allowing for a potential second hit.

The player must hit the Death Egg Robot with the solid rocks a total of six times to progress to the second phase.

Second phase
In the second phase, the player takes control of the Avatar and the Death Egg Robot has six to nine hit points, shifting the perspective to third-person, with the arena resembling that of the arena that Zavok was fought on. At first, like the previous phase, the Death Egg Robot has only two attacks; One is slamming its right main arm upon the platform, creating a series of red-colored shockwaves that must be jumped over or they will damage the Avatar. The other one is relatively easy, which is firing multiple missiles from the hands' fingers, it can also summon lesser robot enemies. During the latter half of the fight, the Death Egg Robot will begin punching the platform with its left arm and firing lasers from it's eye to destroy sections of it, reducing the amount of space to fight on. To damage the mech, there are two options: the Avatar can either wait until the mech slams its arms and get close enough to the core located on its chest and either use the Wispon or the Wire Attack on its it, which does more damage, but is dangerous. They can also attack its right arm, which does less damage, but is considerably safer. After dealing the required damage (if using the Wire Attack on the core, it takes two hits on each phase, making it the manner of having to damage the mech six times, or if using it on the arms, it takes three hits, making the manner of having to damage the mech nine times), the Death Egg Robot will eventually shut down.

Third phase
In the third and final phase, a three-headed white mech with eight tentacle arms that resembles the Nega-Wisp Armor will come out of the core of the Death Egg Robot, before sucking Modern Sonic, Classic Sonic and the Avatar into a Null Space-like dimension. Afterwards, it fires a stream of red energy lasers from its six smaller tentacles, which the trio must jump over or they will receive damage. This mech has sixty hit-points. The main objective of this phase is to get the orbs in order to speed up and reach Eggman's mech. As the trio reach the mech, they must use the Homing Attack to hit the main head seven times. Immediately after that, they must once again use the Homing Attack to hit all of the three heads, with the right head being the last one in order. Later, the mech will reveal a new attack, which consists of firing streams of crimson flames generated by the Phantom Ruby's power, but they are typically easy to dodge as well. However, this attack can be tricky as well, as the mech can form the flaming streams into the shape of an "X", which can be confusing. Later, the mech can also fire its clawed hand from one of its tentacles that have the large clawed hand, which are later accompanied by another attack of red energy lasers. After damaging the Mech further, Sonic will call out for Classic Sonic and the Avatar, enabling them to use a Triple Boost. If pressed successfully, the Trio will attack the Mech, destroying it through its core. Eventually, the Mech explodes, with the Void-like dimension collapsing.

Trivia

 * Despite its name, the Death Egg Robot does not have any connection to its previous incarnations or the Death Egg.
 * The Death Egg Robot has the most hit-points out of any boss in Sonic Forces, it has six hit-points in the first phase, six to nine more hit-points in the second phase, and sixty hit-points in the third phase, making the Death Egg Robot have seventy-two to seventy-five hit-points in total.
 * The final phase of the fight bares a striking resemblance to the Nega-Wisp Armor.
 * The Death Egg Robot is referred to as the "Mega Death Egg Robot" in Sonic Forces ' original soundtrack.