The DCEU (DC Extended Universe) is yet very fresh and still building up, progressing with each movie they release. Fand are not aware about everything but, they took a few stuff out of both New Earth and Prime Earth () to build their cinematic universe and have left behind many aspects from the comics that they didn’t see fit into their vision. So, it means that there are many unexplored concepts and elements which the audience will witness with the Justice League movie.
Previously it was speculated that the Studio is about to adapt thestoryline for the Justice League (2017) film, it was assumed that Darkseid is going to be the main villain and but ’s uncle and the Military Commander of Apokolips was revealed. Steppenwolf as we all have come to know is the main villain for Justice League.
The Mother Boxes are rather the interesting unexplored aspect of DC Extended Universe. By tje last scene of Batman v Superman: Dawn of Justice, the scene involving Lex Luthor also sees him standing in front of of Steppenwolf who then teleports himself away using the power of the three Mother Boxes.
These were also just some assumptions made by the fans (like the holograms vanishing away)? As was the first Justice League trailer released on SDCC 2016, it gave a preview of bunch of Viking-like looking group of men were apparently burying Mother Boxes on the ground. They looked lot human like but they could also be the ancient race of Atlanteans before they went under sea.
The trailer also showed us a glimpse of fierce battle among the Amazons and Parademons on the land of Themyscira, suggesting the presence of another Mother Box. The third location seems to be either in S.T.A.R. Labs or in the possession of Dr. Silas Stone who used it to save the life of his son Victor i.e. Cyborg. That is the three locations for the Mother Boxes so far.
So the big question is, why do Darkseid is after it and why do they need it for?
The reason is very very simple, Darkseid just wants to conquer worlds after worlds of the Multiverse and then turn them into factories to produce armies for him to conquer more worlds. And being his general, Steppenwolf visits those worlds, then invade and win it over before Darkseid sets foot on them. This is very much the scenario for them to be precise.
Mother Boxes are actually sort of ‘living computers’ created using element “X” with New Genesis technology. What it can do is access energy, sustain life forms, heal one from fatal injuries and most importantly even open or close Boom-Tubes for teleportation among worlds and places beyond reach. If you want to invade and conquer a world, you need to transport your army there first and for the inhabitants of Apokolips and New Genesis, Mother Boxes are the most common way of transportation.
Assuming those Viking-like men to be ancient Atlanteans and the fight on Themyscira took place in the past (the latter can also be in the present though since there are no strong suggestion about it that I’ve found), Apokolips already tried to invade Earth once before but somehow failed but they left those Mother Boxes here on purpose so that one day, when the time is right, they can come back and take the world from humans. This is the reason why Darkseidwants those Mother Boxes so badly. So, he sent Steppenwolf to collect them all and transport his army of Parademons to conquer Earth. This was en explaination by a user on Quora.
The theory was greatly put by a user on quora stating “Because, after all those years, when Darkseid recently contacted Luthor and eventually instructed him to create, so that the monster could kill . As per this plan Earth was left vulnerable without a protector (because maybe and realized eliminating that threat first hand would be wise in a different reality) and this will be the perfect moment for invading Earth once again and win it.” This is the best possible explanation for the situation.
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