Rejoining body parts: How would it work?
Reattaching severed limbs is a recurring theme in many monsters, but never has it been explained HOW they reattach their appendages. I doubt the neurons would magically realign and begin to function normally, not to mention the exposure to bacteria and impurities that would risk infection. Whatever the method, reattaching the limb is definitely more energy efficient than regrowing it from scratch.
Some put their arms back together and wait for it to reconnect while others sprout a tentacle that links the severed pieces. Even trickier is reconnecting the head, which some invincible monsters but back on effortlessly.
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