I like writing about creatures that self heal/heal quickly. As long as you know what can kill them, they don’t die.
From Inside the Grey House:
When he had taken enough from the second human, Joseph closed his eyes and blindly nodded to Kimberly. She grasped the end of the staff and pulled it out slowly as Joseph healed his wound. They timed it well, and he bled no more. Once healed, Joseph opened his eyes, looking for more blood. As the two donors slipped out the door, two more came forward to feed him. He smiled his thanks and took what they gave gratefully.
Charlie, not as quick as Mierka, came in as Kimberly was stepping away from Joseph. She still had the staff in hand. A third of it was covered in blood. Charlie smiled in admiration as he knelt next to Natalia. Vincent had a hand on her ankle, but he seemed more interested in staying between Natalia and Joseph, probably for her protection. Charlie placed a full water bottle on the floor next to her, along with some beef jerky, keeping the orange juice in his hand. He really didn’t know what to give her but figured the orange juice would be good for quick energy and the beef jerky good for iron to help her blood loss.
Cat Stark 