Despite being immortal Mermaids are unfortunately not invincible, and could die from violent attacks, or accidents at the hands of supernatural darkness. Those Mermaids who are good will eventually ascend to Heaven because they indeed have a soul. All Mermaids were once human or spring from human heritage via the lost Continent of Atlantis from which Mermaids were created. When they go to Heaven they will be considered human, and will become Angels. Thanks to the scientific reality of parallel Universes Mermaids are normal humans in many of them just as we are Mermaids or Mermen in others. All of us are paranormal beings in some parallel reality.