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Originally Posted by bio9205
Was it ever mentioned what substance the ELS are composed of? (A metal, I assume.) Also, was it ever explained how they shapeshifted and assimilated?
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Not really, and Id doubt it ever will.
As their name says, they are quite literally living metal. What metal, we have no idea but they are alive.
The idea that they are nanites makes some sense. They do not seem like individuals whatsoever, just a collective bunch of things.
The fact that they are collective likely affected how their culture and understanding developed.
Still, we have no idea what their true forms look like or whether they even have one. Their forms seen in the movie are just convenient for space travel.