The scene were The Weapon realises who she is was so well done. Quite a few scenes where pretty moving. And yeah ... My mind went blank before hitting send, ofc you can kill the Endless as I just did lmao. Unless, we just killed a copy of her :P .. Im really intrigued to know why they're referred to as the Endless and it's implications. On a side note I found a few of those doors that look like the ones a monitor usually opens dotted at random spots around the world, wonder if they where cut "dungeons" of some sort.
Maybe they're immortal if they can manipulate time?
Even Forerunners aren't immortal but they can live for a stupidly long time, thousands of years.
Am I the only one who got Flood vibes though? Harbinger straight up quoted Gravemind multiple times and their names are similar (The Timeless One/The Endless), she drove Marines insane just from talking to them, ala Flood.
I need to know more! Lol.