That shyt was dope as fukk to me.
Daddy issues. He's the son of the original Lex -
Alexander Luthor, Jr. - Wikipedia, the free encyclopedia. - or at least that's my take on it. His pops made him obsessed with power and he didn't like that Supes was powerful AND loved. His pops was powerful and terrible so he was pushing that shyt on to Supes. Just like how Degrasse-Tyson was explaining in that interview on TV. Everyone was pushing themselves onto Supes and Lex's version of that manifested into this version of his dad that he had to kill or corrupt
At first, I couldn't fukking stand this version of Bats, but by the end of the movie it made sense. This was the fukked up jaded version that Joker always wanted Bats to turn into.
They dropped hints of Darkseid throughout the movie and the bells rung was for him. He said he was coming from the Stars. I think Lex was having the same dreams that Bruce was having just on the other side of it. During Bruce's dream in the desert Darkseid's Omega symbol was placed in the dirt. The guy reaching out through the boomtube was either Mister Miracle OR Orion from the New Gods (This is from memory so I might be wrong).
I'm quite sure this is one of those movies that people will rewatch, or explanations of things they left to the imagination will come out, and then people will LOVE it. I legitimately don't understand what people hated about this movie by the end of it. It was magnificent to me.