Another con is that vampires are even more immortal than they appear. Even if the vampire's body is completely destroyed, their soul will wander through the universe, unable to affect anything, but still conscious. They can't even communicate with other vampires in that state. They'll get to see universe die starting 10 to the power of 16 years from now (end of star formation) until it's finally dead at 10 to the power of 10 to the power of 120, when universe reaches its final energy state. But at least a new universe will start at 10 to the power of 10 to the power of 10 to the power of 56. (https://en.wikipedia.org/wiki/Timeline_of_the_far_future)
Where does that lore come from? I thought they literally gave up their soul to the devil, or whatever evil thing rules hell, to have physical immortality?
Not a scientist, but that kinda relies on the big bang having infinite energy, which is probably impossible. Eventually gravity will pull everything back together.
The distances between stellar objects are far too apart for gravity to be a remote factor at all. Let alone dark energy is theorised to be the force accelerating the speed at which matter is distancing itself.
The universe will fade out of existence as suns burn out and their heat is lost to space with even the blackholes burning out (hawking radiation) as they too disappear and space turns into the black nothingness. Objects become so far apart that not even if they emitted light you would not be able to see a thing.