I have a theory about why Phil is called the Angel of death! Okay, so you guys all know how Philza is referred to as the “Angel of Death” right? Well I got thinking about that and was wondering why Philza was called that. So I did some research on what the “Angel of Death” means and i found out that the Angel of death in certain religions is the one who is supposed to transport the souls of the dying or the deceased to either heaven of hell. Basically when you’re dying the Angel of death or Azreal which is supposedly the Angel of deaths real name, comes and transports your soul.
Now, Techno is referred to as the blood god because of his skills in battle and how many people he’s killed right? Something like that I’d assume is how he earned that title canonically. So techno and Phil are best friends and never really far from each other. Well if techno is the blood god and Phil is the Angel of death, maybe he’s called that because he is canonically the Angel of death and whenever techno takes a life Phil is responsible to transporting that soul to wherever it belongs, but only for techno’s victims. Anyone else Phil doesn’t bear that responsibility so maybe that’s why Tommy, Wilbur, Jschlatt and Mexican Dream all ended up in the ghost realm or limbo, because the Angel of death didn’t transport their souls to either heaven or hell because their lives were not taken by techno.
Which also makes me wonder if only people in limbo can be resurrected with the revival book bc if their souls haven’t been brought to their final place (heaven or hell) they may be able to be brought back. But if the soul was transported to the final place you can’t be resurrected because if you’re in limbo your soul isn’t fully taken yet, it’s stuck in between life and death despite you being dead which is why you can be a ghost.
This probably isn’t canon but it’s just my theory on why Phil is called the Angel of death based on my research from curiosity.