One of the key plot developments in the days of Future Past story is the creation of the Sentinels. The Sentinels are robotic soldiers that were created for the purpose of capturing or killing mutants. The Sentinels are featured in the Days of Future Past trailers as the new weapon to fight the ongoing threat of mutants. The future scenes show massive numbers of Sentinels being used to hunt down mutants and other super powered beings. The creation of the Sentinels sets the world on course for a cataclysmic future.
Sentinels have no emotion to hold them back. All the Sentinels have is the mission at hand and stopping the mutant population. The lack of emotion makes them effective killing machines. There are no feelings toward those that they are attacking only programing that instructs them to hunt and kill.
The Sentinels are absolutely relentless and they do not give up on a target. The Sentinels do not stop coming and once they find a target they keep sending more and more attackers. There is no stopping the onslaught once it starts. This factor makes the Sentinels an incredible enemy.
Adaptability was one of the chief traits of the Sentinels. Once they were defeated, they would come back with better technology and better tactics. This trait made them incredibly difficult to continually defeat. The result was an ongoing battle with the X-Men that would lead to the future catastrophes.
Some versions of the Sentinels had the ability to detect the X-Gene in individuals and then capture them with little fight.
4. Power Absorption
The futuristic Sentinels have the ability to absorb the powers of a mutant and then pass it on to other Sentinels. It seems that once a Sentinel absorbs abilities it can communicate it to other Sentinels and all of them can use the ability as needed. The ability to mimic the powers of mutants is huge addition to the already existing traits of these monstrous killing machines.
5. Shape Shifting
X-Men Days of Future Past changes the Sentinels to make a more creative story line. One of the new plots is the merging of the Sentinels with DNA taken from Mystique. The Sentinels are no longer merely mechanical but now have a biological component. The new biomechanical Sentinels have the ability to shape shift just as Mystique could and this makes them an even bigger threat than ever. The new Sentinels are extremely deadly and highly effective in their continuous assaults.