It’s not so much about nuclear envelope and more about ends. DNA polymerase (an enzyme that builds new DNA) cannot copy the whole end - there are a few bases that should be at the end but cannot be added. Eukaryota deal with it by a complex mechanism (they have telomeres), but it allows for multiple chromosomes and therefore larger genomes. Bacteria have a circular genome instead, a circle doesn’t have an end, so they can copy as much as they need.

BTW, mitochondria and plastids, being former bacteria, also have circular genomes.

I don’t remeber the movies, but didn’t the dead finish the battle around Minas Tirith? In books, they defeated the fleet of bad guys near the mouth of Anduin, freeing significant army, which then takes the ships anf goes to Minas Tirith. The rest of the battle there is not unusually supernatural, if I remember correctly. I remeber not likig this part of the film. I understand it, but I think this part in particular felt very abrupt.

That’s new, I only know https://theuselessweb.com/